Hoover Air Purifier with TiO2 Technology - WH10200 Ti02 Coated Screen - The Titanium Dioxide coated screen boosts UV effectiveness by helping to remove 99 9% of germs UV Bulb helps remove airborne germs, bacteria, and other microorganisms when exposed to the short ultra-violet wavelengths UV/Ti02 on/off controls are for use during flu season and can also be used all year round The rinsable pre-filter is the first line of defense in the multi-stage filtration system to catch lint, pet hair, and other large particles The HEPA media filter traps 99 97% of dust and pollen, and germs