All-in-one filter system combines HEPA with activated carbon and a separate washable prefilter | This combination filter has been engineered to capture microscopic particles, allergens and volatile organic components (VOC's), and odorous gases | The filter is at the core of purifying your air. Filter replacement is essential for your purifier to perform at its best | 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 | Change indicator light is displayed on purifier when filter needs to be replaced | 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 TruSens Z2000 air purifier