Drying wet basements after flooding – stop mold and germs

amp basement after a flood? Dry the wet basement. But how?

Wet cellar? Damp walls? What should I do? Tips on drying and dehumidifying

If the basement and living rooms show wet masonry after a flood, quick action is required. After removing all soaked objects, the floor covering – and possibly also the wall cladding – it is extremely important: 
Dry the building fabric – as quickly as possible! 

The moisture MUST be removed from the masonry and floor – this is the only way to prevent consequential damage such as mold and dust lice, harmful bacteria and germs. In some buildings, without drying, the statics would even be at risk, because too long exposure to moisture affects the masonry! 

Can the damp cellar be ventilated and fans dried?

Limited. Especially in summer, the cool cellar is a “moisture trap” when outside air with high temperature and humidity is brought in. The humidity condenses on the cool cellar walls – and forms a barrier that prevents the damp masonry from drying out. If you want to dry with fans – make sure that the air output is very high. Only then is it possible to remove moisture at all. Small fans or even just tilt window ventilation is extremely unsuitable – and massive mold growth can result. However, ventilation is nowhere near as efficient as installing air dehumidifiers with SMF particle filters.
These devices work as circulating air dehumidifiers. So you do not need an external wall connection and no air piping.

How does cellar drying work with building dryers?

The dehumidifiers are placed in the damp basement. The air is circulated with an integrated fan and passed over a condensation surface on which the air humidity condenses. The water collects in a container that can be easily emptied. Dehumidifiers and building dryers with SMF filters also bind germs and mold spores to a filter surface. This prevents contamination of the room air through the spread of germs.

With this process, the air humidity is gradually reduced. By lowering the air humidity, the drying layers of air tend to saturate themselves with moisture – and thereby remove the moisture from the wall and the building structure. Successive and sustainable! This process takes time – but it is many times faster than ventilation measures! 

ABOVE ALL: The humidity is kept CONSTANTLY reduced – and this counteracts any mold formation!

How long does it take to dry a cellar after a flood?

The drying time depends on many components: the wall thickness, the degree of moisture penetration, the material of the wall, the thickness of the screed, etc. For water damage drying, normally 1 building dryer is positioned per approx. 25 m2 of surface. The drying time then usually takes 4 to 12 weeks. Of course, you can also dry with a smaller number of dehumidifying devices and move the device (s) from room to room. Every one to two days. The drying time is then longer – but the costs for rent or purchase are cheaper!

Rent a construction dryer – or buy? What makes sense

  In the first phase, rapid drying using a rental dryer is advisable. After removing most of the moisture, you can switch to a single dryer. Experience has shown that the residual moisture diffuses out of the masonry over a longer period of time. Therefore, after the initial drying, you should consider buying a device for long-term dehumidification. In order to reduce germs that inevitably penetrated the rooms during a flood, it should be possible to equip the dehumidifiers with SMF filters or HEPA adapters. Long-lasting and sustainable SMF dehumidifiers are available from specialist retailers from around EUR 600.00.

Water in the insulation layer under the screed

If water has penetrated into insulation below the screed, there is no avoiding professional help. In these cases, extensive drying of the underbody with special blowers / compressors and large-scale dryers usually has to be carried out. In the event of a large-scale damage event, however, the specialist companies will be fully utilized. Thus, the mentioned installation of drying devices remains as an initial measure in order to prevent further damage. If the drying of the surface of the building does not achieve sufficient drying of the floor, then the insulation layer must be dried. However, insulation layer drying can be very complex. The costs for a professionally carried out drying move for 50 m2 of basement area between EUR 1,000 and 3,000 – depending on whether accompanying measures such as B.Faecal germ removal in the subsoil, required or not. With these costs, it is necessary to estimate whether a core renovation – i.e. removal of the subfloor and renewal – is possibly more cost-saving than drying the insulation layer. In this case one is limited to the installation of building drying devices. You will find a schematic representation of the processes used to dry the insulation layerHERE . In serious cases – especially if faecal germs / sludge got into the insulation layer, a complete removal will have to be considered….

Dehumidify – or do you prefer ventilation?

Ventilation in the basement can be problematic, especially in summer. In addition, an excursion into physics: warm air can absorb more water vapor than cold air.
If warm air gets into the basement, this air cools down and can no longer hold the amount of water vapor it contains. The excess moisture settles on the walls. Mold spores find optimal colonization areas on this film of water.

Most of those affected try to get the problem under control through frequent and long ventilation. At first glance, this seems conclusive, but at second glance, this action is unfortunately counterproductive.

Dry damp basement walls

With more ventilation, more moisture comes into the basement from outside. There is increased condensation on the cool cellar walls .

What should be considered when drying a damp cellar? For ventilation, the outside temperature should be lower than the basement temperature, which is why autumn and winter are ideal for ventilating a basement on dry days.

Therefore:   fans and ventilation after a flood can (to a limited extent) be recommended for LIVING ROOMS . For cellars, however, it is essential to ensure suitable drying – ideally with building dryers and SMF particle filters to prevent germ formation !


Health protection in hairdressing salons: Customers welcome air purification

The hairdressing salons have reopened and nothing stands in the way of the haircut. What makes it easier for customers and finally guarantees a hairstyle appropriate to the time of year again, is associated with a high additional burden for the hairdressers: 

Not only is the number of customers increasing, the hygiene requirements are also strict 

and mean for the craftsmen working under difficult conditions .

But what about health in the salons? Where are the dangers lurking and how can the self-employed and salon managers react to them preventively

Hygiene in the salons: working under difficult conditions

Cutting hair with the mask

Hairdressing means: service to people – and not just with scissors and combs. Anyone who works as a hairdresser works as a conversation partner, consultant, listener and of course as a hair artist. Recently, however, hairdressers have also been cleaning staff: Equipped with mouth and nose protection, chairs and, above all, tools have to be laboriously cleaned and disinfected after each customer visit.

But is that really enough?

The latest findings indicate that the indoor air could represent the decisive problem in the risk assessment of a possible viral infection . Even before the time of corona and influenza prevention, there was no question that hairdressers were exposed to increased pollution. 

After a while, many of the employees suffer from the well-known “ hairdresser’s asthma ”, caused by air pollutants and other allergens that are mostly released by dyes, lotions and tints.

In contrast to chemical substances, viruses and pathogens are neither visible nor smell and increase the health risk in closed rooms due to the possibility of unnoticed infection due to poor air hygiene .

Virus-free, healthy air:
This is the air quality in hairdressing salons

Spray aerosol

Indoor air quality is a health issue that is gaining in importance: the average worker spends around 90 percent of his time indoors. In contrast to open-plan offices, the salons pose an additional risk : They are highly frequented places that are visited by many different customers every day.

Each and every one of them leaves innumerable invisible traces:

A single sneeze and cough releases up to 40,000 microfine suspended particles, the so-called bioaerosols. 

Contrary to popular belief, these ultrafine particles, smaller than a fraction of a speck of dust, do not sink to the ground, but stay in the air for up to 5 hours . In the worst case, thousands of potentially infectious viruses that represent a health risk for employees and customers can cross the room with them .

Aerosols: invisible risk of infection in the salon?

The opinions and research results contradict each other strongly. For salon operators and employees who work most of the time in closed rooms, it is important to have reliable statements and recommendations that provide a solid basis for further decisions and measures in the context of occupational and customer protection.

Even without undertaking an extensive scientific excursion, the latest investigations and findings can already be summarized as follows with certainty: A transmission of corona and influenza viruses through the air alone cannot be scientifically excluded , but it can be excluded through low-investment measures demonstrably minimize! The basic problem: Aerosols, enriched with potential viruses, remain in the air and are carried into the back corners of the salon by ventilation and fan systems, which are used particularly in the warm months. Even if you adhere to the now well-known hygiene regulations, the cough and sneeze labels and the prescribed minimum distances, you can not categorically rule out the risk of infection .

But there are measures with which the hairdressers can improve the air quality in their work rooms with little effort in the long term in terms of health protection. Only salons have already reacted. Customers welcome the measures and would like a nationwide implementation for all salons.

Professional air cleaning for a healthy working environment in the salon

If more than ten people are in a room, the pollution of the room air by bioaerosols increases by more than ten times . The operators of hairdressing salons are alarmed: Even in smaller businesses, more than 50 people come and go every day – and that on a few square meters.

Experts advise: In order to sustainably and permanently improve the air quality in terms of health protection, it is essential to ensure proper ventilation .

Air purification

It is not enough “to use ventilation and fan systems to ensure a circulation of the room air that can distribute the aerosol particles even further and more strongly in the room,” according to the head of a study on the health improvement of indoor air quality in closed rooms.

An essential pillar for combating viruses and germs in aerosols is the creation of an environment that is hostile to viruses. If the relative humidity is optimal , viruses have a hard time: Studies show that viruses that are dangerous to us in everyday life – including the Covid-19 virus – are harmless in an environment with a humidity of 40 to 60 percent : 

The storage of proteins and salts from the surrounding air prevents the virus particles from being suspended. The result: the risk of infection can be significantly reduced . In addition, experts recommend working with certified filter systems: HEPA filters ( High Efficiency Particulate Air ) clean the surrounding air from the smallest suspended particles in a highly effective, continuous and sustainable manner.

Low investment for maximum protection:
First employers react and give their customers security

Evidence is growing: Official requirements, which include equipping business premises with professional, antiviral air cleaning systems, could only be a matter of time . Experts are even considering: The rush for professional air purifiers and air humidification systems in everyday work could reduce demand for a long time and cause prices to rise .

Protecting hands

Those who are already investing in their own health, the health of their employees and, last but not least, in the health of their customers are well advised: The first salons are already advertising their business premises with clearly visible notices that provide information on site a professional air purification is used.

Selective surveys reinforce the efforts: Especially customer groups who are at a higher risk of a serious illness in the event of infection welcome the measures and experience the interventions as a sensible and sustainable investment in the health protection of customers. 

A free consultation offers business operators the basis for finding a suitable and inexpensive solution that can be implemented quickly in advance of planning.

The articles document the state of scientific knowledge at the time of publication.
Understandably, no liability can be assumed for the topicality / content and conclusions.
If you would like to receive the latest information on this topic, please subscribe to the The.Pure Air newsletter at:


Well disinfection – how to do it correctly and other important tips!

Well disinfection - Against bacteria, fungi and spores

If a one-off disinfection is necessary, e.g. after working on the well or if hygienic problems occur, the source of the contamination and all contamination must first be carefully removed from the well.

By disinfecting the well and the connected lines, the germs and pathogens in the water die.

We recommend that cleaning and disinfection be carried out by a specialist!

If this process is not carried out by specialists, pay attention to the following: Be careful when using the chemicals (chemical burns possible!), Follow the instructions for use, never work alone!

Disinfection of a source shaft

General preparations

The well should be in good structural condition and all impurities must be removed.

Dirt in the house plumbing

How efficient the disinfection is depends on how much dirt there is in the house installation system. Therefore, existing protective filters should be cleaned or replaced and deposits in the air chamber removed.

If the pre-pressure in the membrane boiler is too low, air must be topped up in order to prevent the formation of stagnant water in the boiler.

Tip on reprocessing devices

The device manufacturer can tell you whether disinfection would damage the device. If necessary, it should be disconnected from the mains during the process.


Since there is constant flow and there is often an overflow, disinfection is difficult to carry out. 

As a result, the dwell time of the disinfectant in the water supply system can be shortened and one would have to descend into the container to carry out the disinfection. 

Since there is often insufficient ventilation, the risk of suffocation is great. Therefore this may only be done with heavy breathing protection.

Important safety information when disinfecting a source container

Sodium hypochlorite produces highly toxic chlorine gas , which can irritate the mucous membranes and damage the lungs.

It is therefore very important to adhere to the following rules of conduct:

  • Never smell the lye or lye dilution!
  • Never work alone, but at least with a second person.
  • If the disinfectant has been poured into the container or well shaft, close it immediately and do not enter it again .

Suggestion for the well disinfection

  • In the case of containers, divert or divert or close the inlet without creating a backwater in the source catchment.
  • Lowering of the water level to about 1/3 of the normal level by using the domestic waterworks or a clean drinking water pump.
  • Empty the corresponding amount of 14% sodium hypochlorite (100 milliliters per cubic meter of water) into the container, taking into account the total volume of water in the supply system (volume of collecting tank, intermediate storage tank, pipe system).
  • Let the water level rise again and, for better mixing, circulate the water.
  • Open all water dispensers until you can smell chlorine and then close again.
  • Do not use water for 12 hours (except for flushing the toilet).

Important NOTE!

It is imperative to avoid disinfectant getting into the receiving water via the overflow. 

If the overflow is likely to start during disinfection, neutralize the overflow in an intermediate basin.

Neutralization with 30% hydrogen peroxide

This process should be omitted if there is no possibility of adding hydrogen peroxide for external neutralization to the system concerned and access would be necessary. 

In this case, the lines are only opened until the chlorine odor can no longer be detected.

If there is the possibility of adding hydrogen peroxide from the outside, the same amount as for the disinfectant is added. 

Then open all taps until you can no longer smell chlorine.

Alternative to one-time disinfection

  • Object disinfection with 0.4 mg / l free chlorine per liter of water for 14 days is recommended if the influx of the spring cannot be prevented. A bacteriological check-up should be carried out after 2 weeks at the earliest.
  • However, this requires precise knowledge of the system and the effort is very high, so this should definitely be carried out by specialists.
well disinfection

Well disinfection – a well shaft

Disinfection of a well shaft

General preparations before disinfecting a well shaft

The well should be in good structural condition and all impurities must be removed.

House installations

How efficient the well disinfection is depends on how much dirt there is in the house installation system. Therefore, existing protective filters should be cleaned or replaced and deposits in the air chamber removed.

If the pre-pressure in the membrane boiler is too low, air must be topped up in order to prevent the formation of stagnant water in the boiler.

Tip on reprocessing devices

The device manufacturer can tell you whether disinfection would damage the device. If necessary, it should be disconnected from the mains during the process.


Well disinfection is described in general below, ie the procedure may be changed in individual cases. The help of a specialist company would be advisable in cases of doubt.

important safety instructions

By sodium hypochlorite highly toxic produced chlorine gas , which can cause mucous membrane irritation and lung damage.
It is therefore very important to adhere to the following rules of conduct:

  • Never smell the lye or lye dilution!
  • Never work alone, but at least with a second person.
  • If the disinfectant has been poured into the container or well shaft, close it immediately and do not enter it again.

Determination of the required amount of disinfectant

The amount of disinfectant required depends on the water level in the well (see table below). Stone and brick wells and water with a high content of organic matter (e.g. in the Waldviertel) need up to twice that amount.

Guide value: approx. 100 to 200 ml of 14% sodium hypochlorite per m3 of water.
Table: Required amount of 14% sodium hypochlorite, calculated with 100 ml sodium hypochlorite per cubic meter of water


  • You need a clean watering can (at least 5 l capacity) and 2 buckets of water.
  • By connecting a clean garden hose to the pipe, the water level is lowered to 2/3 of the initial value. During this process, the walls are hosed down with drinking water.
  • The sediment can be pumped out of the well by returning a partial flow of water to the well while it is being pumped out, thereby stirring up the sediment.

After these processes (water level lowered and walls clean):

    • Fill the watering can 2/3 full with water and add half the required amount of sodium hypochlorite. Use it to rinse the walls of the fountain.
    • 1. Repeat part of the process (2/3 watering can with water + second half of the disinfectant). This time the solution is poured directly into the well shaft (without a distributor head on the watering can).

Important: After adding the disinfectant, you must not bend into the shaft or step on it!

  • When the normal water level in the well has been reached again, all the water taps in the house are opened until a clear smell of chlorine is noticeable, then they are closed again. If no smell of chlorine is noticed, the dosage of disinfectant  must be  increased.
  • The exposure time for the chlorine solution in the well and in the house installations is at least 12 hours (preferably overnight). During this time, no water should be withdrawn (except for flushing the toilet).


The water is neutralized after the exposure time. To neutralize the residual chlorine, 30% hydrogen peroxide is used in the same amount as the sodium hypochlorite.

  • Fill the watering can 2/3 full with water, add hydrogen peroxide and pour into the well. If hydrogen peroxide can be added without starting, the same amount is added as for the disinfectant.
  • Open all water taps and rinse the house pipes until you can no longer smell chlorine.

A bacteriological check-up can be carried out after 2 weeks at the earliest.


How does mold develop? Everything about mold growth!

Types of mold in the apartment, woman horrified

Molds – definition and description

Molds belong to the group of filamentous fungi (Zygo and Ascomycetes).

Of the approximately 100,000 species described , some are particularly important for humans.

Because these cause infectious diseases or spoil food with dangerous mold toxins.

At the beginning of their formation, during the vegetative phase, molds are odorless and can hardly be seen with the naked eye. 

The reproduction takes place with tiny mold spores, which are released into the air. They are harmless to a certain extent for people without prior health problems. 

However, asthmatics, allergy sufferers and people with a weakened immune system are particularly at risk and suffer from a higher risk of developing diseases and increased symptoms if they are infected with mold. 

These include burning eyes, breathing problems, irritation of the mucous membranes, scratching of the throat, fatigue, headaches, stomach, intestinal and joint problems or even neurodermatitis. This can be remedied by professional air purifiers, among other things.

To date, more than 100,000 types of mold have been described worldwide. The total number is thought to be over 250,000 species. 

With that number, it’s not surprising that some species specialize in survival in human living areas. 

If no countermeasures are taken, they are harmful to health.

Mold growth under the microscope

Mold spores are practically everywhere and are spread through the air. They can only grow where there is a suitable breeding ground, for example on damp surfaces. 

Using an air purifier can reduce the amount of mold spores in the air.

Mold growth is therefore always due to moisture and often develops in secret. The air inside is usually warmer and therefore absorbs more water than the cold outside air.

If this air is not exhausted sufficiently and in a suitable manner, it can condense in various places in the house. These damp spots are an ideal breeding ground for mold and bacteria.

When does mold develop in buildings?

The reason for a mold infestation can be the poor condition of the building or structural defects, but the formation of moisture due to the presence of people also plays an important role. 

Mold growth along the baseboards

Every person releases between 1 and 3 liters of water through their skin within a day. Cooking, showering and bathing also increase the “moisture production”, just like indoor plants. Especially when several people live in a confined space, there is an increased risk of mold growth.

Damp wall corner

Where does mold appear – the most common problem areas

Contrary to popular belief, mold does not only occur in old buildings. One can often observe that new houses are occupied too quickly and that this leads to mold growth.

It takes one to two years for all of the moisture to evaporate from the masonry. Built-in furniture or ceilings that have been drawn in at a later date literally seal off the moisture and consequently create an ideal living space for the mushrooms.

Mold is most common in bedrooms and children’s rooms and of course in the bathroom . In addition, lintels, room corners and the back of cupboards are often affected by the infestation. In severe cases, mold can even form on furniture and wallpaper.

Once mold has spread to the living space , it rarely disappears by itself. Air purifiers can be used as a preventative measure to prevent mold infestation

Mushrooms in the flower pot

How does mold develop? Other ways in which mold can develop

Newly isolated windows can represent an additional reason. If the outer wall is poorly insulated, moisture condenses on the cold walls: a perfect starting point for mold to multiply.

The formation of moisture is particularly promoted by drying laundry, frequent preparation of hot dishes, and bathing and showering. This is because most of the water evaporates.

It is therefore advisable to think about purchasing an extraction system and an air purifier. Too low a room temperature (<18 ° C) also has a positive effect on the formation of mold.

Moisture – the best friend of mold growth

A high level of humidity provides molds with ideal conditions to settle down in apartments and houses. It should be noted that in a four-person household, depending on the intensity of use, up to 15kg of moisture is released in 24 hours.

The absorption capacity of the ambient air for moisture is linearly related to the air temperature. 1 m³ of air can absorb around 23 g of water at 25 ° C. At 20 ° C air temperature this figure is reduced to 17 g and at 15 ° C even to 13 g.

This trend continues even at temperatures below 0 ° C. The absorption capacity is only 2 g when the ambient temperature is -10 ° C.
Molds feel particularly comfortable when the air humidity is above 65%. Then they settle and can flourish splendidly.

Control of the humidity

The interplay of moisture, warmth and subsequent condensation on a cold surface create ideal conditions for the growth of mold spores.

Hygrometer for measuring humidity

Incorrect and too long room ventilation increases this. Warm air absorbs moisture more easily and to a greater extent. If this cannot escape, condensation forms, which settles on walls, window frames and furniture, among other things.

With the help of a so-called hygrometer, the moisture content in the air can be determined very easily. This should show less than 60% even in winter.

At values ​​around 50% everything is in the green area and the risk of mold formation is greatly minimized. An air purifier can also help to improve the indoor climate and prevent the risk of mold growth.

You can buy suitable moisture measuring devices and air purifiers in the .

Measures against excessive moisture in the air

  • The percentage of moisture in the air should not exceed 60%. Therefore: regular checks using a hygrometer and use of an air purifier.
  • Ventilate regularly, but NOT continuously! Ventilate at night or early in the morning in summer. When airing during the day in the hot season, the humidity in the building increases.
  • If possible, dry laundry outdoors and not in the tumble dryer, otherwise summer condensation will increase.
  • Uniform heating of living spaces in winter because: Warm air can absorb more moisture than cold air. To save energy and to prevent the outside air from heating up, switch off the heating when ventilating.
  • The ideal temperature for living spaces is 19 to 21 degrees. The difference to other rooms should not be more than five degrees. The doors to cool rooms should be closed, otherwise the warm air will condense on the cold walls. The indoor climate should be improved with an air purifier.
  • Ensure that closed bathrooms are drained after bathing and dry fogged windows with a cloth.
  • In the case of structural defects, the following should be observed: Do not place pieces of furniture directly in front of the wall. The distance to the wall should be at least 10 cm.
  • Attaching large pictures and thick curtains is not recommended.

Questions from practice

Damp wall corner

How does mold develop on damp walls?

One of the most common causes of mold formation is damp wall areas. The formation of these damp spots is very much related to the room temperature and the humidity. If the walls are cooler than the ambient temperature, water droplets adhere to the cold masonry. That is why walls should never be cooled down by ventilating too long in the cold winter months. An air purifier can also be useful in keeping the air free of harmful substances. Damp and wet walls can of course also be due to technical defects such as broken water pipes or structural defects.

How does mold develop in the bedroom?

During the night, everyone perspires between 0.5 and 1 liter of water. Since almost all people prefer cooler bedroom temperatures, the walls in these rooms are also cooler.

However, as already mentioned in the previous chapter, the dew point rises and the risk of mold increases due to the high amount of moisture that is given off when sleeping.

As a result, the bedroom is at the highest risk of mold infestation after the bathroom. Using an air purifier can help minimize this risk.

Moisture on the window

How does mold develop on the window?

Mold formation on windows is quite common due to incorrect ventilation. Usually this is hidden under the grout. Only when the infestation becomes stronger do you notice black spots in the window corners or even on the window frame.

Since windows are less insulated than walls due to the glass surface, condensation very often forms there, especially at the edges. If this is not wiped away regularly, mold stains can appear very quickly. Skylights are particularly prone to this.

How does mold develop in the bathroom?

During daily use, the bathroom produces the greatest amount of moisture from all household rooms. Particular attention should be paid to windowless bathrooms, where the air, saturated with water vapor, is very difficult to escape. 

Silicone grout in the bathroom

That is why the bathroom is a real paradise for molds of all kinds and offers perfect conditions for their reproduction. They usually arise on the silicone joints or on the rubber seals of the shower and bathtub. But can just as well grow on bathroom walls. The excessive amount of mold spores in the air can be decimated by an air purifier.

How does mold develop in the basement?

Most basement rooms are extremely prone to mold due to their architecture. Surrounded by cold floor, the temperature of the outer wall surfaces is relatively low compared to other rooms. 

Man in respirator when removing

As we already know, this is exactly what promotes the formation of condensation and thus the development of mold in the basement.

How does mold develop on the outside wall?

Up until now, there has only been talk of mold indoors, but external walls can also be affected by an infestation.

This is mostly due to structural defects such as cracks or inadequate insulation.

Cold air can penetrate the top layer of the facade unhindered, which promotes the formation of condensation.

Seasonal issues – explanations and details

Mold growth in summer and winter

The widespread opinion that mold mainly occurs in winter is unfortunately not true. Mold infestation can also occur in summer under certain circumstances.

In particular, the increase in humidity caused by breathing air during sleep is often underestimated. If there is also incorrect ventilation, it is easy for molds to multiply.

In winter you have to ventilate regularly, otherwise the humidity can very quickly become quite high due to domestic activities.

It is important to ensure that the room is not ventilated for too long , otherwise the cold air will condense on the warm walls. This increases the risk of mold.

Which rooms are particularly at risk in summer?

basement, cellar

There are many possible causes for the mold infestation during the summer months. Basement rooms are most often colonized by mold at this time of the year. Because of their cold walls, basement rooms are usually more at risk than other rooms. 

How does mold develop in winter?

In the cold season of the year, living spaces are particularly at risk for mold. In winter, people tend to spend a lot more time in their living rooms. That means a lot more moisture is formed. Through incorrect (especially too long) ventilation. The risk of mold is very high.

As previously described, cold air can hold much less moisture. The excess humidity condenses and thus provides a habitat for mold.

If, on the other hand, there is no or very seldom ventilation, the accumulated and excessive air humidity cannot escape and the same problem occurs.

Therefore: ONLY ventilate in winter!

Mold cause number 1 – too HIGH indoor air humidity

In summary, humidity management is the most important mold prevention tool.

Only if increased humidity is permanently reduced, there is a chance of getting problems with molds under control. Air purifiers and air dryers can help reduce the risk of harmful mold growth.

The following procedure is recommended:

1. Evaluate the causes of the moisture
“A specialist can be very helpful here!”

2. Sustainable removal of
mold “Chlorine spray and anti-mold paint are only intended for cosmetic correction!”

3. Improve surveillance, monitoring and indoor climate Use useful technical devices such as air purifiers and regenerative dryers


Dehumidifier with Pump 50 Pint 4,500 Sq. Ft, Dehumidifiers

Dehumidifier with Pump 50 Pint 4,500 Sq. Ft, Dehumidifiers for Large Room or Basements 6L Water Tank with Drain Hose Intelligent Humidity Control, Continuous Drainage Bedroom Bathroom

Product details

Outstanding Efficiency: The dehumidifier removes 50 pints (70 pint 2012 DOE standard) of moisture daily from large rooms up to 4,500 m², perfect for living room, basement, bedroom, closet, bathroom, etc. Intelligent dehumidification: built-in humidity and temperature sensor intelligently keeps the room humidity in the comfortable range of 45% -55% – based on the ambient temperature

Easy access to the drain: press the “Pump” button to divert the water either to the basement window or to the sink; Simply connect a hose (not included) to the drain for continuous gravity drainage Automatic On / Off Timer:

Program the 24-hour on / off timer to start automatically and remove excess moisture while you are sleeping or not at home for worry-free dehumidification and superior energy efficiency Overflow protection: When the 6 liter water tank is full, the dehumidifier switches off automatically and the tank fill indicator lights up to alert you to empty the tank

Package Dimensions 23.94 x 13.15 x 10.31 inches (60.8 x 33.4 x 26.2 cm)

Item weight 44.5 pounds (20.03 kg) ASIN B0987Y2KDX

Item model number EE015 Zigani brand

Color white and black

Capacity 50 pints Item weight 44.5 pounds (20.03 kg)

Continuous operating mode

Question: Will this device automatically reset if the power goes out?

Answer: According to the operating instructions: – Automatic restart If the dehumidifier switches off unexpectedly due to a power failure, the dehumidifier starts automatically with the previous function setting when the power supply is restored.

Question: Does this have the Energy Star marking?

Answer: yes

Question: Does this device have a connection for a garden hose for continuous drainage? No photo was provided.

Answer: Yes it has a connection only no hose. It comes with a 1/4 “pump drain hose if you want to use this feature

Question: What is the seller / brand contact details? I can’t seem to find the answers I’m looking for so I’d love to get in touch!

Answer: Dispatched from and sold by BSTZ

Question: What is the decibel level?

Answer: I do not know the DB level, but it is very quiet, I do not notice when it is in operation.

Question: does the water automatically pump out or does someone have to press the pump button?

Answer: The pump function must be switched on by pressing the pump button. In addition, the water float only triggers the switch when the water tank is full.

Question: I live on the second floor and my postman refuses to carry anything heavy up the stairs. Does anyone remember how this was sent to you? usps? UPS?

Answer: Ours came UPS

Question: How high can the drain water be pumped out of the device vertically?

Answer: After the water tank is full, the pump will return to pumping and the remaining third of the pump water will not drain completely so it will circulate.

Question: Can you clean the filter?

Answer: yes

Question: Does 1/4 inch hose automatically pump out?

Answer: Continuous water drainage – using a continuous water drainage hose Water can be automatically emptied into a floor drain by attaching the device with a continuous water drainage hose (not included) and an internal thread (not included). The floor drain or a suitable drainage facility must be lower than the drainage of the dehumidifier. Make sure that the water hose is not kinked or kinked so that the water can drain off smoothly.


hOmeLabs 4,500 Sq. Ft Energy Star Dehumidifier

hOmeLabs 4,500 Sq. Ft Energy Star Dehumidifier for Extra Large Rooms and Basements

4,500 sq ft dehumidifier: Our 15.4 x 11 x 24.3 inch dehumidifier with 1.6 gallon water tank capacity removes up to 50 pints (70 pint 2012 DOE standard) from the air per day, depending on the humidity level and size of your Space.

This is our largest and most capable model, ideal for large rooms up to 4,500 square feet and / or very humid rooms.

Developed for a modern home: The fact that most dehumidifiers are chunky eyesore is not new to anyone. We designed with the modern consumer in mind: a sleek, clean look, handy built-in wheels and handles, and a quiet fan that won’t drown out your current obsession. Super easy to use: dehumidifiers don’t have to be complicated, so ours aren’t. Set your ideal humidity setting and then let it run its continuous 24 hour cycle until the tank is full, at which point it will automatically shut off.

No time for that?

There is also a drain hose outlet for continuous emptying. The hose is not included in the scope of delivery; We recommend a garden hose with a diameter of ⅝ “with an internal thread and optional Teflon tape for additional security.

Eliminates moisture, odor, and other things you hate: moisture is a bad word. Our portable dehumidifier reduces odors and moisture through its built-in pump compressor. It also features a turbo mode that increases the fan speed from Normal Air CFM 165 (cubic feet per minute) to High Air CFM 188 for maximum moisture removal and odor reduction.

Product dimensions 15.4 x 11 x 24.3 in (39.1 x 27.9 x 61.7 cm)

Item weight 40 pounds (18 kg)

Manufacturer homeLabs ASIN B073VBWKJZ

Item model number HME020031N HOMELabs brand

color white Capacity 1.6 gallons, 50 pints

Item Dimensions LxWxH 15.4 x 11 x 24.3 inches (39.1 x 27.9 x 61.7 cm)

Item weight 40 pounds (18 kg)

Operating mode continuous, comfort, standard

Base area 4500 square meters

Upper temperature range 35 degrees Celsius

Question: Pump does not work. Water flows into the reservoir. Why?

Answer: Works great. Hose on, runs directly into the floor drain. Container dry. I’m not sure why anyone would have a problem with this device. Pump against gravity I go with gravity. If the battery dies due to gravity, your biggest problem won’t be moisture.

Question: Would that work well in the south? Like Florida?

Answer: I live in the Houston, Texas area and the device does a remarkable job of reducing the humidity here, so I see no reason it wouldn’t do the same in Florida. Please note that the device comes standard with the CONTinuous switch activated, which prevents you from changing the humidity setting up or down. If you turn off the CONT switch, you can set the device to the humidity that you are comfortable with. I currently have mine set to 40 and it turns on and off as the humidity rises and falls in my house. At a setting of 35, the dehumidifier runs almost continuously and refills the water tank in 24 hours or less. If you leave the CONT switch on, your first impression is that the device is broken. The FAQs and manual are of no help and if another test hadn’t explained this problem I would have sent the device back thinking it was defective. I am very happy with the device and have set the fan speed to high, which controls the humidity in three or more large rooms. I didn’t run the device at too slow a speed so I can’t say how well this would work. The noise that is generated at both speeds is not too annoying and barely noticeable.

Question: I am trying to understand who the actual company is for this product. Can someone tell me who you are

Answer: Home Technologies, LLC is a privately held New York, NY corporation and is a single location company. 37 East 18th Street Floor 7 New York, NY 10003 Categorized under Household Appliances Wholesalers. Current estimates show that this company has annual sales of 260617 and employs approximately 5 people. Find out if it has the same floor number.

Question: Will this device automatically reset if the power goes out?

Answer: According to the operating instructions: – Automatic restart If the dehumidifier switches off unexpectedly due to a power failure, the dehumidifier starts automatically with the previous function setting when the power supply is restored.

Question: How big is the drip tray on the 50 pint model?

Answer: The size of the bucket is 1.6 gallons. The 30 model is 0.8 gallons. The 70 pint model is the same as the 50 pint model with a 1.6 gal capacity.

Question: Is it a problem if the dehumidifier is oversized? Couldn’t get the humidity of 400 sq ft basement below 60% (out of 70) with 30 pints when looking at 70 pt. thinks

Answer: Bigger ones simply have more capacity when needed. So they draw more electricity, remove more water and switch off. Overall, there is no longer any heat, the little ones just run longer to do the same job, if they can at all. The 70pt unit has roughly twice the throughput, so that would work better if the 30 couldn’t. A big one should catch the water and turn it off, so … No heat once the set point is reached. It should later turn on again as needed to maintain the setpoint. Concrete is porous to water vapor (and radon), so depending on your geographic location, most of the moisture is likely to seep through the basement slab. You could seal the concrete. That helps a lot. When it comes to concrete blocks, there are fewer options. The air conditioning throughout the house is roughly 10 times the capacity of these units. A medium-sized dehumidifier increases the temperature in a closed room by 3-4 degrees after a few hours. A full basement …. probably not affected by temperature much. Small devices generate less heat because they don’t remove much water either. You should publish the efficiency values ​​to really know how much water is removed per kWh of energy consumed. A large 70-pint 400-watt device that runs 4 hours a day (for example, to keep the humidity below 50%) needs the same power for the same task as a 100-watt device that runs 16 hours a day. A small silent (Peltier chip version) in the same place would never finish. You need 20 of these to keep up (based on their specs). Devices with a compressor are usually louder, but far more efficient than the quiet electronic Peltier chip (typically 45 watts). These remove about 1/50 as much water as a compressor model, so they tend to run all the time and take several days to fill a small bucket as they don’t have much throughput. Each style has its purpose. Tiny, quiet models are suitable for closets and bedrooms, but have little effect in a larger living room or basement. Most of them seem to use the same little 45 watt chip.

Question: I want to use this product at home when I’m on the go. I’ll be gone twenty days straight. It will drain continuously over time.

Answer: Did you read the instructions? it states the following: the hose should NOT be connected, the bucket should be in place, the power should be off, and the machine should NOT be CONNECTED. Then remove the bucket, plug in the hose, making sure there are NO kinks and flowing straight down into the drain with no hose draining up or down. When placed in place with the correct inches on the back and sides. Put the bucket back into the round rubber hose opening, then plug it in and turn it on, whichever you want to do. There is no continuous button. It knows the hose is there and will continue to work. If you are away and there is a power outage, it will not turn on. Malfunction cannot be turned on. In the event of a burn, you have insurance and a lawsuit.

Question: Can this be used with a device timer? Or would clicking on the timer to turn on the device also require you to press the power button again!

Answer: Yes, you can use a timer. The humidistat is probably better suited for the task. Keep in mind that these types of devices age quickly while cycling. My dad would dump these things and after 20 years they were covered in dirt and were still working. Instead of cleaning it, he replaced the device.

Question: If this product has an Energy Star rating, why doesn’t it have an Energy Star label like other Energy Star products?

Answer: Wrong and here is Energy Star certification:


Waykar Commercial Dehumidifier 296 Pints

Waykar Commercial Dehumidifier 296 Pints Large Industrial Dehumidifier with Garden Hose

Product Details

LARGE CAPACITY COMMERCIAL DEHUMIDIFIER – This industrial commercial dehumidifier can remove up to 296 litres (37 gallons) of water per day, suitable for use in large areas, warehouses, grow rooms, basements, garages, cellars, workshops, libraries, laboratories and small factories etc .

INTELLIGENT HUMIDITY CONTROL – Automatic humidity control: Simply adjust your ideal humidity setting, intelligently detects room humidity and controls dehumidification to maintain preset humidity levels. Auto shut-off/on: Automatically turns off when the room humidity reaches the set humidity level and resumes operation when the humidity level is higher. Auto restart function in case of power failure: It will restart automatically when power is available.

portable design for large space – This is a portable industrial dehumidifier with a sleek and modern look. With four universal wheels and two ergonomically placed handles, you can easily move this dehumidifier around your environment. The rear housing opens like a door, allowing you to store the drain hose and other accessories inside.

CONTINUOUS DRAINAGE MODE AVAILABLE – This dehumidifier comes with a 40-inch drain hose. Simply connect to the drain hose, you no longer need to pour water from the water bucket, just set your desired humidity (10-90% RH) and it will automatically turn off when it reaches the point. Packaging Dimensions 84.2 x 23.6 x 17.7 inches (86.9 x 59.9 x 45 cm) Item Weight 116.4 pounds (52.38 kg) Manufacturer Waykar ASIN B087C2JYJS Brand Waykar Colour Black/White Capacity 296 pints Operating Mode Continuous

Question: Can the Kar 296 ppd dehumidifier be used in this way in the cannabis grow room?

Answer: Definitely

Question: Does this Waykar 296 ppd dehumidifier use 110V or 220V?

Answer: 110v. It does tend to pull a large load, however, so be careful what else is running.

Question: What is the minimum and maximum operating temperature?

Answer: 41 ° F- 100 ° F

Question: How big is the hose bracket (us or metric)? I already have one and I see that it is not a standard size for the US garden hose and that I want to expand it.

Answer: Have you checked this size? Seems smaller but I haven’t had a chance to verify.

Question: Can this be used in a greenhouse?

Answer: Hello yes. I have it in my conservatory full of African violets, anthuriums etc which was too damp.


Waykar 155 Pints Commercial Dehumidifier Industrial

Waykar 155 Pints Commercial Dehumidifier Industrial Dehumidifier for Crawl Spaces, Basements, Whole Homes

Product details

LARGE CAPACITY COMMERCIAL DEHUMIDIFIER – This industrial commercial dehumidifier has a highly efficient moisture removal capacity, can remove up to 155 liters of water per day and is suitable for use in large areas, basements, crawl spaces, grow rooms, garages, basements, workshops, libraries, laboratories and small factory, etc.

SMART TOUCH CONTROL – Automatic humidity control: Simply adjust your ideal humidity setting, intelligently detect room humidity and control dehumidification to maintain preset humidity levels. Auto Power Off / On: Automatically turns off when the room humidity reaches the set humidity and resumes operation when the humidity is higher.

HUMANIZED DESIGN – This heavy duty commercial dehumidifier is equipped with a detachable controller with 10m cable and a humidity sensor with 5m cable for large areas where remote control and monitor are required. Design for different placement needs, you can hang or hang the humidifier anywhere.

AUTO DEFROST & POWER FAILURE RESTART FUNCTION: The automatic defrost function eliminates maintenance and enables this long-lasting room dehumidifier to be used in a cold environment of up to 41 ° F. This basement dehumidifier is also designed to automatically restart when power is available. Package Dimensions 26.2 x 19.3 x 17.5 inches (66.5 x 49 x 44.5 cm) Item weight 74.8 pounds (33.66 kg) Manufacturer Waykar ASIN B08FWY3YQR Waykar brand Capacity 150 pints Auto Defrost mode

Question: What is the noise level?

Answer: Was very quiet – could hardly tell it was operating

Question: What is the current strength? and is it rated with an Energy Star?

Answer: According to the operating instructions, the nominal power is 950 watts at 8.5 amps

Question: Does this plug into a normal 110 socket? Is it 220?

Answer: Standard 115V plug

Question: How big are the inlets and outlets?

Answer: inlet 8 “and outlet 6”

Question: Why is the air on this device reduced to percentage humidity? Answer: 30%

Question: is this plug-in or hard-wired?

Answer: plug it in


Waykar 4500

Waykar 4500 Sq. Ft Dehumidifier for Home Basements Bedroom Garage, Removes 9 Gallons Moisture/Day, with Continuous Drain Hose, 1.18 Gallons Water Tank and Four Air Outlets

Product details

DEHUMIDIFIER FOR ROOMS UP TO 4500 SQ FT- Our dehumidifier is capable of removing up to 70 pints (below 95 ° F, 85% RH) of moisture per day. (Please note: under 95 ° F, 85% RH condition, the maximum dehumidification capacity is up to 70 pints) in areas up to 4,500 square feet. Ft and adjust the humidity from 30% to 85%. It is a dehumidifier ideal for basement, office, home, bathroom, bedroom, kitchen, storage room, living room, laundry room, basement, crawl space, large room / room, etc.

UNIQUE DESIGN FOR THE MODERN HOME – The Waykar dehumidifiers in a modern look. With built-in wheels and ergonomically placed handles, you can move this dehumidifier easily. A quiet fan that won’t bother you while you sleep or work, adjustable fan speeds for multiple choices. There are 4 air outlets on the four sides of the dehumidifier instead of one side, this design improves the dehumidification speed.

INTELLIGENT TOUCH CONTROL – The dehumidifier has an intelligent touchscreen touch control panel that you can easily operate. Automatic humidity control: Simply set your ideal humidity setting, intelligently detect room humidity and control dehumidification to maintain pre-set humidity levels. 24-hour timer: For preset operation and reduced energy consumption. Auto Power Off / Power On: Automatically turns off when the bucket is full and turns on again after the bucket is emptied.

DESIGNED FOR SAFETY – Waykar dehumidifier with safety standby mode features that prevent overheating. Overflow protection and alarm functions available when the water tank is full for additional security. Internal components made from heat-resistant materials. Child lock and sleep mode function, you can press the “LOCK” button for 2 seconds to lock the dehumidifier.

With kids at home, parents are less likely to worry about messing up the device.

Product dimensions 11.4 x 11.4 x 25.19 inches (29 x 29 x 64 cm)

Item weight 30 pounds (13.5 kg)

Manufacturer Waykar ASIN B07VWHR7LQ

Item model number PD253B

Waykar brand color white

Capacity 9 gallons Item

Dimensions LxWxH 11.4 x 11.4 x 25.19 inches (29 x 29 x 64 cm) Item weight 30 pounds (13.5 kg)

Operating mode sleep, safety standby

Upper temperature range 35 degrees Celsius

Question: Do we need to buy new filters for this dehumidifier?

Answer: No, there is a removable filter screen on the back of the device that collects dust particles. If it’s dirty, it can be washed off in a sink and put back in the machine.

Question: Makes a loud noise and the case was cracked. What should I do ? when it arrived

Answer: Mine has not been damaged and is not loud. It must have happened when shipping. I would contact the returns department from whom you purchased it. I am sure you would get it right. You would be very happy if it wasn’t corrupted as it works great.

Question: Will this dehumidifier cover the whole house?

Answer: It will be 4,500 sq ft.

Question: How many watts does this humidifier consume?

Answer: 445 watts

Question: What is the noise level?

Answer: You can hear it for sure, but it’s not annoying, more like a fan. White noise with some trickling noises. At the high level (which I think is necessary for good operation) it is about a third as loud as my previous Frigidaire dehumidifier.

Question: How long is the power cord ???

Answer: About 6 feet. This is THE best dehumidifier out there. I’ve tried the top rated and they didn’t stand up to constant use in Key West.

Question: Even if the hose is connected, it is still connected to the manual drain. How can I connect it to a hose?

Answer: On mine, I had to screw the cap on the drain AND then remove a little black rubber stopper that fits in too well (which I overlooked at first) and then connect the drain hose. Then it went to the continuous process without any problems and there is no water in the bucket.

Question: Can it connect a fixed hose to a basement drain and not disrupt operations? Far a holiday home?

Answer: Yes, it can be plugged in permanently, if something goes wrong it will shut down automatically


Kesnos 70 Pint Dehumidifiers

Kesnos 70 Pint Dehumidifiers for Spaces up to 4500 Sq Ft at Home and Basements PD253D,White

About this

KESNOS DEHUMIDIFIER FOR ROOMS UP TO 4500 SQ FT – Our dehumidifier removes up to 70 pints (below 95 ° F, 90% RH) of moisture per 24 hours, suitable for medium to large rooms in areas up to 4,500 m². Ft. and is able to adjust the humidity from 30% to 85%, you can easily maintain a healthy humidity range of 45% to 55%!

A dehumidifier perfect for the home, basement, office, bathroom, bedroom, kitchen, storage room, living room, laundry room, basement, crawl space by removing moisture.


– The Kesnos dehumidifiers are designed in a sleek and modern look. With hidden 360 ° castors and ergonomically recessed handles, you can move this dehumidifier easily. It’s quiet operation that won’t bother you while sleeping or at work, and adjustable fan speeds for multiple choices. With the clothes drying feature, you simply place the dehumidifier in a room where you can hang up wet clothes and let clothes dry naturally.


– Simply set your ideal humidity setting and then let it run its continuous 24 hour cycle until the tank is full, after which it will automatically shut off. 2 drainage options for your drainage options:

Automatic Drain:

The included 2 m (6.56 foot) drain hose ensures continuous automatic draining of your dehumidifier without emptying the water bucket.

Manual drainage:

The 1.18 gallon water tank and bucket full indicator lets you know when the water bucket needs to be emptied.


– This digital display dehumidifier provides convenient and accurate humidity display, you can easily operate it. Automatic humidity control: Simply set your ideal humidity setting to intelligently detect room humidity and control dehumidification. 24-hour timer: allows you to preset the time to turn the device on or off.

Auto Power Off / Power On: Automatically turns off when the bucket is full and turns on again after the bucket is emptied.


– All Kesnos dehumidifiers are covered by a 30-day money-back guarantee, a 1-year guarantee, a 2-year extended guarantee when you register your product and lifelong technical support from experts. If you have any questions, please do not hesitate to contact us, we will reply you within 24 hours and help you solve the problems.

Powerful dehumidifier

Keep your space comfortable: Kesnos’ 70 pints dehumidifier is equipped with a powerful compressor and a 112 CFM system. It can quickly and quietly extract up to 70 pints (below 95 ° F, 90% relative humidity) of moisture per day from the air, making it suitable for medium to large rooms in areas up to 4500 m². Ft. Designed with an adjustable humidity range between 30-80% and an intelligent humidity control system, you can easily set the ideal room humidity for maximum comfort. It’s a dehumidifier perfect for the home, basement, RV, office, living room, basement, and crawl space by removing moisture.

Main features of the Kesnos dehumidifier

Automatic humidity control: you can easily set your ideal humidity setting, it intelligently detects the room humidity and controls the dehumidification to maintain the preset humidity values. 24-hour timer: Allows you to preset the time for switching the device on or off and to reduce energy consumption.

Automatic switch-off / switch-on: Automatic switch-off when the bucket is full and on again after the bucket has been emptied. Automatic defrost function: prevent the machine from freezing, keep it working continuously even in a cold 41 ° F environment.

User-friendly design: full tank warning and automatic shutdown; Safety standby mode that prevents overheating; Internal components made of heat-resistant material.

Parental control setting: allows you to lock the control panel to prevent someone from changing the settings. Simply press the “LOCK” button for 2 seconds to lock the dehumidifier. With kids at home, parents are less likely to worry about messing up the device.

Easy maintenance Occasional cleaning is a must for this dehumidifier. Wipe the water tank about every 2 weeks and wash the air filter twice a month with a soft cloth and water.

Easy to move This Kesnos portable dehumidifier has a sleek and modern look. With its 360 ° hidden, easily rolling wheels and ergonomically recessed handles, you can move it easily.

The air outlet opens automatically Do not place heavy objects on the device and do not allow children or pets to sit on the device. Keep clothing at least 40 cm away from the air outlet to prevent water from entering the unit.