Do Ozone Generators Kill Mold? Usage and Safety

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Ozone generators are devices that emit ozone which is used for removing air pollutants. They simply disinfect the air by removing germs and odors. In some cases, ozone generators are also used in purifying water. Ozone generators kill mold but only when they produce ozone at levels that are unsafe for human beings and other living things.

Ozone is capable of killing mold spores in the air but household ozone generators are regulated to produce ozone at safe levels which may not be sufficient enough to instantly kill mold on porous surfaces and those found in hidden areas. At safe levels, ozone doesn’t kill mold or other organisms.

Do Ozone Generators Kill Mold?

How do ozone generators work?

Ozone generators create ozone (O3) through the following methods:

1. Ultraviolet radiation

Ultraviolet radiation splits oxygen into individual atoms which can then combine with oxygen (O2) to form ozone gas. This method is similar to how the sun’s UV rays create ozone in the upper parts of the earth’s atmosphere. This method is, however, quite inefficient and requires lots of UV radiation.

2. Silent corona dishcarge

Electrical discharges split oxygen molecules into individual oxygen atoms. The atoms then attach themselves to oxygen molecules (O2) to form ozone (O3). This process is much more efficient than UV radiation. In nature, electrical discharges such as lightning produce large amounts of ozone at once.

At high concentrations, ozone is very effective in attacking and killing mold, its spores, and mildew. The gas has abilities to deteriorate the cell structure of most microorganisms. When attached to the mold, ozone molecules stop them from multiplying and eventually destroy them completely.

Some types of ionizing air purifiers emit ozone and also produce negatively charged ions that attract various forms of dust particles found in the air including mold. Others also have a collecting plate where the heavy particles get collected. And those without a collecting plate, the heavy particles land on surfaces and are later cleaned out. 

Do ozone generators really kill mold?

In dealing with the menace of mold, you need first to remove all moisture content so that you can avoid the growing back of mold after having your home cleaned. Ozone is a gas found in the upper atmosphere and it protects us from harmful radiation.

It is important, however, to note that when ozone is found near the earth’s surfaces, it becomes harmful and causes skin cancer, lung damage, among other health complications. 

Ozone generators are regulated in terms of the amount of ozone gas that they emit. The gas can effectively kill mold if it is in large quantities than what is approved for use in homes. The more the concentration, the more effective it becomes in killing mold spores.

Some ozone generators do not effectively kill mold and other biological pollutants because they emit a small amount of ozone gas. They mostly work by trapping the mold spores and making them heavy so that they settle on other surfaces and are later be cleaned up. They do not therefore literally kill mold, but just remove it from the air. 

Further, ozone generators do not effectively kill mold from materials like air conditioning duct lining and ceiling tiles. This is because they mainly focus on airborne particles. For that reason do not expect ozone generators to kill all the mold in your central air conditioner

It is important to note that ozone generators do not kill mold entirely on their own, you need to clean the affected area with antimicrobial cleaners. Sometimes the affected area could be badly damaged, which would necessitate replacement. Any source of moisture should also be eliminated.

How Long Does Ozone Take to Kill Mold?  

Mold spores can generally be killed by ozone in an average of 3 to 6 hours. This is, however, dependent on the concentration levels of the ozone. An estimate of between 24 to 48 hours has also been proved to be effective.  

With a high concentration of ozone therefore, it shall take a relatively shorter time for it to kill the mold and mold spores. The vice-versa is true with low levels of ozone concentration.  

It is also very important that you root out the cause of the mold before using ozone generators. This is important because ozone only kills the mold but does not eliminate it if the conditions are favorable for its growth.  

The removal and clean-up of mold should first be carried out before using the ozone generators. Ozone generators mostly concentrate on airborne mold spores. This implies that it is a clean-up process that is preceded by other forms of cleaning. 

Can you be in a House with an Ozone Machine?  

The safety of the ozone machine mainly depends on how well you use it and the space in which you put it matters. It’s not safe to be in the same room with an ozone machine since ozone gas is harmful to the health of animals, plants, and human beings.

We have pets that stay in our houses and like birds especially, they do not put up with large amounts of ozone. For human beings, when you breathe in ozone or be exposed to it, it causes lung and skin damage among other health hazards.  It is more harmful to young children with a developing immune system and to people with pre-existing medical conditions. 

Since ozone disintegrates at a relatively fast rate, a maximum of 4 hours should be enough time before the occupants of the house can move into an area that had an ozone generator. 

Another issue of concern about not being in a house with an ozone machine is that ozone reacts differently to different materials. This has been proven when items like carpets were corroded as a result of exposure to ozone. Being in a place where the ozone machine is therefore it is harmful. 

How Long Does It Take for Ozone to Dissipate?

To dissipate is an irreversible reaction of an agent or a molecule to disappear. In our context, therefore, it means the time required for ozone gas to go away or become a different element altogether. After using an ozone generator device, you need to know how long it takes for ozone to dissipate so that the place is once again safe for habitation. 

There is no specific time that we can conclusively say that ozone takes to dissipate. It largely depends on the concentration of the ozone gas. Ozone normally lasts for an estimated time of between 30 minutes to 4 hours. Here, the third oxygen atom breaks away from the other 2 oxygen atoms and forms the safe and breathable oxygen. 

If the ozone levels are highly concentrated, it shall take between 3 to 4 hours for ozone to dissipate. It is therefore recommended that you wait for 4 hours after switching off the ozone generator before you can return to that place where it was. 

The type of ventilation you have also determines the dissipation time. A good ventilation system will mean that the ozone gas shall disperse at a fast rate compared to a poorly ventilated place. Temperature levels also determine the rate of dissipation. Warm temperatures break down ozone molecules faster than cold temperatures.

Final Thought

Mold and mildew are very harmful and similarly is the ozone gas. It is important if you explore other safe forms of mold remediation and mainly focus on preventing the growth of mold in your home. While you can use ozone to kill mold, using it within the public health standards isn’t enough to kill mold.


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