The 03 Pure air Purifier and Sterilizer combines the best technologies available today to cleanse the air of 99.9-percent of all airborne pollutants. Not just a filter, not simply a purifier, the 03 Pure air purifier is the best of both worlds. The purifier features a 7-stage filtration system. The initial dirt, dust, and debris pre-filter traps large particles. A washable HEPA filter with a 99.3-Percent filtration rate. The UV2 ultraviolet sterilization stage mimics the sun’s sanitization properties. Artificial UV energy has proven to be 1,600 times more effective than the sterilization effect of the sun in killing mold spores,mildew bacteria, and other airborne antigens. The photo-catalytic filter oxidizes toxic fumes and decomposes odorous substances into odorless carbon dioxide and water. It also removes airborne bacteria and may help with deactivates viruses. The activated carbon filter effectively removes bad smells, odors, smoke, etc. Note: This unit does not ship to California and is not a medical devise.