The Leitz Replacement H13 is an all-in-one filter system that combines an H13 HEPA filter with an activated carbon prefilter. This combination filter has been engineered to capture ultrafine airborne particles including bacteria, viruses, dust, allergens, pet dander, volatile organic compounds (VOCs), and odorous gases. The H13 HEPA filter captures a minimum of 99.95% of ultrafine particles between 0.1 and 0.2 micron (MPPS). The change indicator light is displayed on the purifier when the filter needs to be replaced. The Leitz Replacement H13 filter is compatible with Leitz TruSens Z-1000 Small Air Purifier.