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What Is an Ozone Generator Used for in Restoration?

Last updated October 31, 2026

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The short answer

How Ozone Works

Ozone is a reactive form of oxygen. The generator creates it by adding energy to normal oxygen, turning O2 into O3. That extra oxygen atom is unstable, so it readily reacts with odor molecules, mold spores, and other organic material, breaking them down.

The process changes the chemical structure of contaminants. This is why ozone is useful for smoke smell, pet odors, or mildew that lingers after water damage. It can reach into fabrics, drywall, and wood where surface cleaning cannot go.

When Pros Use It

Pros typically use an ozone generator after the affected area is dry and the obvious debris is removed. It is a finishing step for odor control, not a first response. For example, after a flood cleanup, the pros might run an ozone treatment to remove musty smells from carpets or upholstered furniture.

It is also used for fire or smoke damage, where odors cling to walls and belongings. The space must be sealed off because ozone is harmful to breathe. Pros will set it up, leave the area, and return after the cycle finishes.

  • Neutralizes odors from smoke, pets, and mildew
  • Kills mold spores and bacteria on surfaces
  • Reaches into porous materials like drywall and fabric
  • Used after drying and cleaning are complete
  • Requires the room to be empty and sealed
  • Safe only when no people or pets are present

Safety Precautions

Ozone is a lung irritant. You should not be in the room while the generator runs, and you should not re-enter until the pros say it is safe. They will air out the space after the treatment to bring ozone levels back to normal.

If you feel unwell after exposure, see a doctor. Also, keep children and pets away during the process. Ozone can also damage rubber and some plastics, so items like electronics or car tires may need to be removed.

Limitations to Know

Ozone does not clean surfaces. It does not remove soot, dirt, or physical stains. Those must be handled with cleaning and, if needed, removal of damaged materials. Also, ozone cannot fix structural issues like rotted wood or corroded wiring.

For serious contamination, ozone alone is not enough. It works well for odor and microbial control, but water damage often requires extraction, drying, and repairs. The pros will assess the situation and decide if ozone is a useful part of the plan.

Do You Need One at Home

You can buy small ozone generators, but they are risky to run without training. The wrong settings can leave harmful levels of ozone in your living space. For most homeowners, it is safer to let the pros handle ozone treatment.

If you live in Fresno, where the hot semi-arid climate means dry conditions, odors from a past flood may linger longer in porous materials. A professional can set up the equipment properly and ensure the area is safe to re-enter.

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Frequently asked questions

Can an ozone generator remove all mold?

Ozone can kill mold spores on surfaces, but it does not remove mold growth or its roots. Dead mold can still cause allergies. For visible mold, you need physical removal and proper drying. Ozone is a supplement, not a complete mold solution.

How long does an ozone treatment take?

A typical cycle runs from a few hours to overnight, depending on the size of the room and the odor level. The pros will seal the space, run the generator, then vent the area. You should expect to stay out until they confirm it is safe.

Is ozone safe for all materials?

No. Ozone can degrade rubber, some plastics, and certain fabrics. It may also fade colors. Pros will remove or protect sensitive items before treatment. If you are unsure about something, ask the pros to check it before they start.

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