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What Is a Hydroxyl Generator Used for in Restoration?

Last updated October 26, 2026

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The short answer

How It Works

A hydroxyl generator uses ultraviolet light to create hydroxyl molecules from moisture in the air. These molecules react with odor-causing compounds, breaking them down into harmless byproducts like carbon dioxide and water. This process is similar to how the atmosphere cleans itself after a thunderstorm.

The machine circulates air through the unit, and the hydroxyls spread throughout the room. They penetrate porous surfaces where odors hide, such as carpet padding, upholstery, and wall cavities. Unlike ozone generators, hydroxyl generators are safe to use while people and pets are present, so the work can continue without evacuating the home.

Common Uses

Pros bring hydroxyl generators to homes after water damage, sewage backups, or fire and smoke events. The machines neutralize odors from mold, mildew, smoke, and pet accidents. They also help reduce airborne bacteria and viruses, which is useful after flooding or when moisture has lingered in a space.

You might see a hydroxyl generator running in a room with wet drywall or a flooded area. It works alongside drying equipment and cleaning steps. The goal is to remove the smell at the molecular level, not just mask it with air fresheners. This makes the space more comfortable and habitable again.

  • Neutralize smoke odors from fire damage
  • Eliminate musty smells from mold and mildew
  • Reduce odors from sewage or flood water
  • Help with pet urine and other biological smells
  • Kill airborne germs and some surface microbes
  • Safe for use around people and pets

Benefits over Other Methods

Hydroxyl generators are a dry process, so they don't add moisture to an already wet area. This is a big advantage after water damage, where drying is critical. They also don't leave chemical residues, making them a good choice for homes with children or sensitive occupants.

Compared to ozone generators, hydroxyls are less harsh. Ozone can be harmful to breathe and may require you to leave the home during treatment. Hydroxyl generators run continuously, even while you sleep. They work in the background, breaking down odors as they circulate, which means less disruption to your daily routine.

When It's Not Enough

Hydroxyl generators are powerful, but they can't fix structural damage or remove standing water. If drywall is sagging, insulation is soaked, or flooring is buckling, those materials need to be removed and replaced. The generator treats the air and surface odors, not the physical damage.

For deep contamination, like sewage or long-term mold, the source must be cleaned or removed first. A hydroxyl generator can't make mold disappear or dry out saturated wood. Pros use it as one step in a larger restoration process, not a standalone solution. You may need additional equipment like dehumidifiers or air scrubbers.

What to Expect

When the pros use a hydroxyl generator, you'll notice a clean, fresh smell that gradually replaces musty or smoky odors. The process can take several hours to a few days, depending on the size of the space and the severity of the odor. You might see the unit running in a corner, with a fan pulling air through it.

The cost of using a hydroxyl generator is part of a larger restoration job, so it depends on the extent of the damage and the time needed. For a single room, it might be a small addition to the overall service. For a whole house, the generator may run for days. Your local water damage pros can explain what your situation requires.

  • Run time varies with room size and odor level
  • Works well in enclosed spaces with good air circulation
  • Often used alongside air movers and dehumidifiers
  • No need to leave your home during treatment
  • Results are noticeable within hours for mild odors
  • For severe cases, multiple days may be needed

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Frequently asked questions

Is a hydroxyl generator safe to run while I'm home?

Yes, hydroxyl generators are safe for occupied spaces. They produce hydroxyls that are naturally present in the atmosphere. Unlike ozone, they don't pose a respiratory risk. Still, follow the manufacturer's guidelines and keep the unit away from direct contact with eyes or skin.

Can a hydroxyl generator remove mold?

It can kill some mold spores on surfaces and reduce airborne spores, but it doesn't remove existing mold growth. The mold must be physically cleaned or removed first. After that, a hydroxyl generator helps eliminate lingering musty odors and prevents spores from spreading.

How long does a hydroxyl generator need to run?

For light odors, a few hours may be enough. Strong smoke or sewage smells can take a day or more. The pros will run it until the odor is gone, checking progress periodically. The size of the area and the type of odor influence the time needed.

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