The filter is at the core of purifying your air and replacing it is essential for optimal air purifier performance | This 2-in-1 filter combines a carbon prefilter for capturing large particles like hair and dust with a HEPA type filter for trapping small particles | 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 such basic household odours and airborne allergens | Carbon prefilter captures odours and certain gasses, and offers the first level of defence against dust and pet hair | Change indicator light is displayed on purifier when filter needs to be replaced | Change indicator light is displayed on purifier when filters need to be replaced | Compatible with TruSens Z1000 Air Purifier