The TruSens combination filter has been engineered to collect microscopic particles, allergens and volatile organic components (VOC’s), and odorous gases. 360 degree filtration draws in air from all directions, collecting pollutants from around the room that may affect allergy and symptoms. Washable prefilter offers the first level of defence against dust and pet hair. Hand wash with mild soap as needed. Carbon filter captures odours and certain gases. Replace every 3 months. HEPA Type filter removes pollutants as small as 0.3 microns – that’s roughly 30 times smaller than a strand of hair. Change indicator light is displayed on your air purifier when filters need to be replaced. Compatible with Leitz TruSens Z-2000 air purifier.