Hello Darren and Jon;
In regards to your questions concerning ozone. Just to be clear I own a service in Michigan that kills mold and odors from properties by appying a shock treatment of ozone. Ozone is FDA opproved, EPA registered, Certified Organic, and the generators we use are UL approved. We use UV light generators that take the oxygen from the air, splits the atom and fills the property with a ozone cloud. Anywhere the air goes the ozone goes. The ozone will not penetrate the drywall, however, if you have mold between the drywall you have oxygen getting in the wall through crackes. The ozone will find the cracks and seep into the wall, killing the mold.
The ozone kills the mold, however it does not clean, the mold is turned into a powder that can be washed off the wall or vacuumed. The spores and the microtoxins are dead also. You still may have to replace the drywall if the mold has damaged the materials.
During the treatment the property must be vacate of people and animals, because the levels of ozone generated are unsafe. However, ozone turns back to oxygen in about 15 minutes. We treat the property for 24 hours to kill mold.
We save investors money because we do not remediate. The lastest attic we treated, the investor got quotes for $8000.00 to remediate, we charged $500.00.
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Hope this helps.
Denise