You can remove 99.9% of contaminants from the air and surface by using the WellisAir - Air & Surface Disinfection Purifier. An alert is sent when everything is clear. (OH) radicals are found in ozone. These OH particles are used by WellisAir to kill surface- and airborne viruses. Radicals in WellisAir absorb hydrogen molecules from viruses and bacteria and bind them to oxygen to form H2O. Totally harmless and completely clean. (OH) technology is capable of cleaning the surface and air of an entire area. This cover covers up to 1000 square feet of living space, depending on the layout. Using WellisAir, you have the best disinfection system available that beats UV and HEPA