The HEPA Titanium Dioxide Coating Filter by Airpura helps to create the most effective and complete chemical and volatile organic compound filtration available today. This replacement filter for the Airpura P600 Plus Air Purifier features a special coating of titanium dioxide which when combined with the P600 Plus' TitanClean Reflector and UV Germicidal Lamp creates an additional 3 times of the photocatylitic capacity to combat even the heaviest of airborne chemical concentrations. Capable of trapping 99.97% of particles as small as 0.3 µm, this is a true HEPA filter designed to remove harmful pollutants from your home or business' indoor air.