WellisAir - Air & Surface Disinfection Purifier eliminates 99.9% surface and airborne contaminants. Signals when clear. (OH) Radicals are generated in nature and found in the ozone. WellisAir uses these OH particles to destroy surface and airborne viruses. OH + H = H2O WellisAir OH radicals steal hydrogen molecules from viruses and bacteria and join them with oxygen to form tiny water molecules. Completely harmless and clean. Clean the entire areas' surface and air with (OH) technology. Covers up to 1000 square feet for large rooms, homes, and businesses depending on layout. More effective than UV and HEPA technologies, WellisAir is the best disinfection system available.