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How Ozone Generators Work and When They're Used Safely

Last updated October 25, 2026

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The short answer

What Ozone Generators Do

An ozone generator creates ozone gas, a reactive form of oxygen, by splitting oxygen molecules with an electrical charge. This gas attaches to odor molecules, bacteria, and mold spores, changing their chemical structure so they become harmless. That is why the equipment is useful after a flood or leak, when musty smells linger in walls, carpets, and upholstery.

The process is different from simple air fresheners. Ozone does not mask odors; it breaks them down at the source. For water damage, the pros may use an ozone generator after extraction and drying to address stubborn smells. However, the gas is powerful, so it requires careful handling and a space that is sealed off from living areas.

  • Oxidizes odor-causing molecules
  • Helps neutralize mold and bacteria
  • Reaches porous materials like drywall and fabric
  • Leaves no chemical residue
  • Requires the room to be vacant during use

Safe Usage Conditions

Safety depends on ventilation and timing. Ozone gas is harmful to breathe, so the space must be empty of people, pets, and plants during treatment. Windows and doors should be closed to keep the gas concentrated, then opened afterward to air out the room completely before anyone re-enters.

The length of treatment varies based on the room size and severity of the odor. You should never stay in the room while the generator runs. If you feel unwell after re-entering, see a doctor. The pros follow these same precautions, using meters to check ozone levels and ensuring the area is safe before you return.

  • Keep doors and windows closed during operation
  • Remove all people, pets, and plants first
  • Ventilate thoroughly after treatment ends
  • Monitor air quality before re-entry
  • Follow the manufacturer's instructions

When Ozone Generators Are Used

Ozone generators are most helpful after the water is already extracted and the space is dry. They address lingering odors from mold, smoke, or sewage that regular cleaning cannot remove. For example, after a basement flood, the pros might use one to treat musty smells in concrete and wood.

The equipment is not a substitute for drying or cleaning. It works well as a final step in the restoration process. If you live in Burnsville, you may see this approach after a burst pipe or flooded basement, where moisture has soaked into porous surfaces and left a persistent odor.

  • After water extraction and structural drying
  • For odors from mold or mildew
  • For smoke or sewage smells
  • In basements, crawl spaces, or sealed rooms
  • When other cleaning methods fail to remove the smell

Risks and Precautions

Ozone can irritate your lungs, throat, and eyes, especially if you breathe it in high amounts. People with asthma or respiratory conditions are more sensitive. That is why the generator should only run in an unoccupied space, and you should wait until the ozone dissipates before re-entering.

Never use an ozone generator in a room with open flames, as the gas can be reactive. Also, avoid using it on certain materials like rubber or some plastics, which may degrade. The pros know these limits and adjust their approach based on what is in the room. If you are unsure, ask a professional for guidance.

  • Never run it while you are in the room
  • Avoid use near flames or heat sources
  • Check that materials like rubber are not damaged
  • Wait until the ozone clears before re-entry
  • Keep windows open during air-out time

When to Call the Pros

If the odor is strong or the water damage is extensive, professional help is wise. The pros have the right equipment and know how to use it safely. They can also assess whether ozone is the right tool, or if another method like structural drying or dehumidification is needed first.

For a severe flood or a lingering smell, you can ask local water damage pros to inspect the situation. They will evaluate the extent of the damage and recommend a safe plan. You can also check your policy to see what your insurance company covers. Policies vary, and your insurer decides what is covered.

  • Inspect the affected area for hidden moisture
  • Use structural drying before ozone treatment
  • Map out where moisture has spread
  • Clean up water damage thoroughly first

Need help right now?

Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

How long does an ozone generator need to run?

It depends on the room size and the strength of the odor. Some treatments take a few hours, while others need a full day. You should never stay in the room during treatment. Afterward, allow time for the ozone to clear, then check if the smell is gone.

Can I use an ozone generator in my home while I sleep?

No, you should never run an ozone generator while you are in the home or sleeping. Ozone gas is harmful to breathe. The room must be vacant, and you should only re-enter after the area is ventilated and the ozone has dissipated. Always follow the manufacturer's safety instructions.

Will an ozone generator remove all mold?

Ozone can help neutralize mold and its odors, but it does not remove the mold itself. The affected materials may need to be cleaned or replaced. The pros often use ozone as a supplement to drying and cleaning, not as a replacement. For health concerns, see a doctor if you feel unwell.

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