Modern methods of disinfecting premises have made great strides forward, offering solutions that were previously available only on an industrial scale. One of these decisions was dry fog, which is actively used for processing apartments, private houses and office spaces. This technology allows the smallest particles of disinfectant to penetrate into the most inaccessible places, providing deep cleaning of air and surfaces from bacteria, viruses and unpleasant odors.
Unlike traditional wet fogging, it uses the principle of instantaneous evaporation and subsequent condensation of the liquid. Cold fog generator breaks the disinfectant solution into microscopic droplets ranging in size from 5 to 50 microns. Due to this size, the particles do not settle immediately, but float in the air for a long time, evenly filling the entire volume of the room, including the space behind the furniture, ventilation ducts and textile coverings.
The use of this technology becomes especially relevant during periods of epidemics, when fighting mold or after repair work. Microparticles capable of enveloping objects from all sides, which cannot be achieved with a conventional spray or wet cleaning. However, despite its high efficiency, the technique requires strict adherence to safety rules and the correct selection of chemical reagents.
Working principle of a cold fog generator
The basis of the process is a special device that turns a liquid solution into an aerosol cloud. Ultrasonic generators or devices with compressor spraying create a powerful jet of air that breaks the liquid into nanoparticles. It is important to understand that the term "dry" is relative: a liquid remains a liquid, but due to the microscopic size of the droplets, it behaves like a gas, leaving no wet marks on surfaces when used correctly.
The key parameter here is the particle size. If the droplets are too large (more than 100 microns), they will quickly settle under the influence of gravity without fulfilling their function in the upper layers of the air. Variance must be optimal so that particles can move randomly, collide with microorganisms and be adsorbed on surfaces. This process takes a certain amount of time, usually from 30 minutes to an hour, depending on the volume of the room.
There is a misconception that dry fog is steam. Steam is actually a gaseous state of water that is invisible. Fog is a suspension of tiny droplets visible to the eye. It is this suspension that creates the effect of “milk” or a thick cloud filling the room. Concentration active substance in the air at such moments reaches peak values, which guarantees the death of pathogenic microflora.
⚠️ Attention: There should be no people or pets in the room while the generator is operating. Although many solutions are safe, high concentrations of aerosol in the air can cause respiratory irritation or an allergic reaction.
The efficiency of work directly depends on the preparation of the premises. Before starting the device, it is necessary to close the windows, doors and, if possible, turn off the forced ventilation system so that the cloud does not evaporate prematurely. Tightness processing is a guarantee that the disinfectant will remain in the air for the necessary time to react with viruses.
Differences from wet cleaning and ozonation
Many property owners wonder: Why pay for fogging when you can just clean your floors with bleach? The answer lies in the physics of the process. Wet cleaning is effective only on those surfaces that the cloth can reach. Aerosol disinfection covers 100% of the volume, including carpet pile, sofa upholstery, curtains and the insides of cabinets, where it is difficult to reach with your hands.
Let's also compare it with ozonation. Ozone is a powerful oxidizing agent that kills bacteria well, but it is extremely aggressive to materials. Rubber and some plastics and fabrics can be damaged by prolonged exposure to high concentrations of ozone. Dry fog, especially those based on quaternary ammonium compounds or hydrogen peroxide, acts more selectively and often has a prolonged effect.
Another important difference is the residual effect. After ozonation, there is nothing left in the air except oxygen. After treatment with dry fog, the thinnest, invisible to the eye, forms on the surfaces. antimicrobial film. It continues to work for several more days or even weeks, preventing bacteria from reproducing. This is especially valuable for children's rooms and medical offices.
The table below shows the comparative characteristics of different disinfection methods:
| Parameter | Wet cleaning | Ozonation | Dry fog |
|---|---|---|---|
| Penetration into tissue | Low | High | Maximum |
| Residual effect | Missing | Missing | Yes (up to 2 weeks) |
| Safety for Electronics | Risk of moisture ingress | Safe | Safe (with the right dispersion) |
| Elimination of odors | Disguise | Complete elimination | Complete elimination |
What odors and pollution does the technology eliminate?
One of the main reasons for the popularity of the method is its ability to combat persistent odors that have been absorbed into walls and furniture for years. Chemical reaction, which occurs when the active substance comes into contact with odor molecules, leads to their splitting rather than masking. This is fundamentally important for apartments where people have smoked for years, or houses where animals lived.
Dry fog effectively copes with the following types of contaminants:
- 🐈 Smells of domestic animals (urine, fur, “wet dog”).
- 🚬 Tobacco smoke and nicotine tar deposits on the wallpaper and ceiling.
- 🍲 Persistent kitchen aromas (fried fish, garlic, burnt food).
- 🏗️ Smells of building materials (varnishes, paints, primer, dust).
- 🦠 Smells of mold and dampness that occur after flooding.
The fight against mold deserves special attention. Fungal spores are microscopically small and easily spread through the air. Conventional treatment of walls with bleach removes visible plaque, but the spores remain deep in the plaster or behind the baseboard. Fine suspension penetrates into the pores of materials, destroying mycelium and preventing re-growth of colonies.
Safety for people, children and pets
The issue of toxicity is the most pressing when discussing this technology. The safety of the procedure depends 90% on the chosen disinfectant. Professional companies use drugs of hazard class 4-5 (low or moderately dangerous), which are completely safe after drying and airing.
However, “dry fog” is still chemistry. At the moment of spraying, the concentration of the substance in the air exceeds the permissible standards hundreds of times. That's why evacuation removing people and animals from the premises for the duration of treatment and exposure (usually 1-2 hours) is a mandatory requirement. Ignoring this rule can lead to poisoning or a severe allergic reaction.
As for plants, the situation here is ambiguous. Some types of indoor flowers may react negatively to chemical attack by dropping leaves or turning yellow. Chlorine-containing preparations especially aggressive towards green mass. It is recommended to either remove the plants from the room or carefully cover them with plastic wrap before starting work.
⚠️ Attention: After treatment, airing for 30-60 minutes is required. Only after the particles have completely settled and the smell of chemicals has been removed from the air can you be in the room without protective equipment.
There are additional risks for aquarium and terrarium owners. Many drugs are toxic to fish, amphibians and reptiles even in small doses. Aquariums it is necessary to seal it tightly or temporarily move it to another room, since the air filtration system can draw chemical vapors inside.
Step-by-step instructions for preparing the premises
The quality of the final result depends not only on the master and equipment, but also on how the room was prepared. An unprepared room is a waste of money, as fog will settle on open trash or not penetrate closed drawers. Algorithm of actions must be clear and consistent.
First of all, it is necessary to carry out dry cleaning: vacuum the carpets, remove scattered things, toys and clothes from the floor. The mist settles on all surfaces, and if a dirty sock is lying on the floor, it will be disinfected along with its contents, but this does not eliminate the need to wash it.
☑️ Checklist for preparation for disinfection
Food, personal care products, open cosmetics and medications must be placed in sealed bags or taken out of the room. Although modern drugs are safe, contact with chemical aerosols on food is unacceptable. Dishes It’s also better to hide it in cabinets or cover it.
It is advisable to move furniture away from the walls by 10-15 cm to ensure circulation of fog behind cabinets and sofas. Cabinets, dresser drawers and kitchen doors, on the contrary, need to be opened slightly. This will allow steam to penetrate inside and disinfect the space where clothes or kitchen utensils are stored.
Selection of equipment and chemical reagents
There are many generators on the market, but not all of them are suitable for high-quality disinfection of residential premises. Household air humidifiers will not create the required dispersion. Professional required cold generator (ULV - Ultra Low Volume), which is capable of producing particles of the desired size. The power of the device is selected based on the cubic capacity of the room.
As for chemistry, several groups of substances are in the lead here. Preparations based on hydrogen peroxide and silver are considered the safest and most effective. They break down into water and oxygen, leaving no toxic traces. Quaternary ammonium compounds (QACs) have a long-term antimicrobial effect, but require more thorough rinsing from contact surfaces.
It is important to distinguish between disinfection (killing germs) and deodorization (eliminating odor). Often, to achieve the best effect, a two-stage treatment is used: first a disinfectant composition, and then an odor neutralizer. Enzyme preparations excellent at breaking down organic odor sources such as animal urine.
Treatment cost and frequency
The price of the service is determined by several factors: room area, degree of contamination, type of drug used and urgency. Treatment for viruses (for example, after an illness of a family member) usually costs less than complex removal of burning or mold odors, which requires more expensive reagents.
For prevention in normal conditions (offices, apartments with children), it is recommended to carry out treatment 1-2 times a year, preferably in the off-season. In situations where there are people with allergies or asthma in the house, the frequency can be increased in consultation with the doctor. Economic feasibility here is high, taking into account the extension of the service life of furniture and the reduction in morbidity among household members.
You shouldn’t skimp on calling professionals by buying a cheap generator for your home. An error in the concentration of the solution can lead to property damage or health problems. Professional disinfection is an investment in safety and comfortable living.
How long does the effect last after treatment?
The disinfecting effect (killing bacteria) lasts as long as the surfaces remain clean. Antimicrobial film can last from 10 to 14 days. The odor elimination effect is usually permanent if the source is eliminated (e.g. urine is cleaned up) rather than simply masked.
Do I need to wash my floors after dry fogging?
If preparations based on QAC (quaternary ammonium compounds) were used, it is advisable to wipe contact surfaces (tables, handles, floors) with a damp cloth 2-3 hours after airing. Preparations based on silver and peroxide usually do not need to be washed off.
Can upholstered furniture and mattresses be treated?
Yes, this is one of the main advantages of technology. The mist penetrates deep into the filler, killing dust mites and bacteria. However, the furniture must be dry. If the mattress is wet, the effectiveness is reduced and pre-drying is required.
Is dry fog harmful to electronics?
When using the right ULV generators, the particles are sized so that they do not cause short circuits, unlike coarse atomization. However, it is better to turn off equipment that is turned on, and cover open contacts.