The short answer
The Science Behind Ozone
Ozone, or O3, is a molecule made of three oxygen atoms. The extra oxygen atom is unstable and readily reacts with other substances. When ozone gas contacts odor molecules, it oxidizes them, changing their chemical structure. This reaction transforms the smelly compounds into simpler, odorless substances like carbon dioxide and water.
For example, the smoke smell from a fire or the musty odor from water damage consists of volatile organic compounds. Ozone attacks these compounds at a molecular level, effectively destroying them rather than just masking them. This is why ozone treatment is often used after severe water damage or flooding, where odors can penetrate deep into porous materials.
How the Machine Works
An ozone machine, also called an ozone generator, produces ozone by passing air through a high-voltage electrical field or by using ultraviolet light. The machine is placed in the affected room, and the room is sealed with windows and doors closed. The ozone gas fills the space and circulates through the air, reaching cracks, fabrics, and other surfaces where odors hide.
The machine runs for a set period, typically from a few hours to overnight, depending on the room size and odor intensity. During this time, the ozone continuously reacts with odor molecules. After the cycle, you must ventilate the room thoroughly before re-entering. Proper ventilation clears out the residual ozone, making the space safe again.
Safety Precautions
Ozone is a powerful oxidizer and can be toxic to humans and animals. Breathing ozone can cause chest pain, coughing, and throat irritation. Therefore, you must vacate the area and remove all living things, including plants and pets, before starting the machine. Seal the room completely to contain the gas.
Remove items that ozone can damage, such as rubber, latex, and certain plastics. Cover or take out electronics. Make sure no one is in the room or adjacent areas where ozone might leak. If you share walls with neighbors, warn them to avoid exposure. Safety should always be your top priority.
When to Use Ozone Treatment
Ozone treatment is ideal for stubborn odors that linger after cleaning, such as smoke damage, pet urine, or the musty smell from water damage. It works well on porous materials like drywall, wood, carpet, and upholstery, where odors can be deeply embedded. However, it is not a substitute for proper cleaning; you should first remove the source of the odor, like wet materials or mold.
For water damage situations, the pros often use ozone as part of a comprehensive odor removal strategy. They may combine it with thorough drying, cleaning, and disposal of unsalvageable items. If you have had a flood or a burst pipe, consider contacting local water damage pros for an inspection to determine the right approach.
- Smoke from fire or cigarettes
- Pet urine or feces odors
- Musty smells from water damage
- Mildew in carpets or fabrics
- Odors from spoiled food or garbage
- Lingering smells after flood cleanup
Limitations and Alternatives
Ozone treatment has limitations. It may not remove all odors, especially those from deep within structural materials, and it can damage certain materials like rubber, leather, and some plastics. Also, it does not kill mold spores or bacteria; it only neutralizes odors. For mold issues, you need a mold professional to address the root cause.
Alternatives to ozone include thermal fogging, which uses a heated solution to penetrate surfaces and neutralize odors, and hydroxyl generators, which produce hydroxyl radicals that are safer for occupied spaces. For mild odors, simple cleaning with enzymatic cleaners may suffice. For severe cases, the pros may combine methods to achieve satisfactory results.
Preparing and Aftercare
Before running an ozone machine, you need to prepare the space. Remove all items that might be damaged by ozone, such as rubber mats, latex gloves, or certain plastics. Take out plants and cover or remove electronics. Clean the area thoroughly to remove any dirt or residue that could react with the ozone.
Once the machine has run its cycle, you need to ventilate the room thoroughly. Open windows and doors to let fresh air in and push the ozone out. Use fans to speed up the process if needed. Wait until you no longer smell the sharp, clean scent of ozone before spending time in the room. Inspect to see if the odor is gone; if not, you may need another treatment or a different approach.
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Call Now (510) 318-3798Frequently asked questions
How long should I run an ozone machine?
Running time depends on the size of the room and the severity of the odor. Typically, it can range from a few hours to overnight. Follow the manufacturer's guidelines and start with shorter cycles, then check if the odor is gone before running it again.
Can I stay home while the ozone machine runs?
No, you should not stay in the room or the building while the machine is operating. Ozone is harmful to breathe and can cause respiratory issues. Leave the premises and only return after the machine has finished and the area has been ventilated properly.
Does ozone remove mold smells permanently?
Ozone can neutralize the odor temporarily, but it does not kill mold or remove the source. If mold is present, you need to address the moisture problem and remove the mold itself. A mold professional can help with that, and then ozone might be used to clear lingering smells.
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