This activated carbon pellet filter is specifically designed to help combat common cooking and cleaning odours, and reduces airborne VOCs such as ammonia, acetone and formaldehyde. This carbon layer fits with the Odor & VOC Filter drum on all TruSens Medium (Z-2000) Air Purifiers. The carbon filter offers the first level of defense against odors in your home. The activated carbon filter helps combat cooking and cleaning odours, and reduces airborne VOCs such as ammonia, acetone and formaldehyde. This layer is what needs to be replaced on the Odor & VOC HEPA drum filter. Filter replacement is essential for your air purifier to perform at its best. For best results, replace carbon filter every 3 - 4 months. Change indicator light is displayed on purifier when filter needs to be replaced. Fits with the Odor & VOC Filter drum for all TruSens Medium (Z-2000) Air Purifiers. Pack includes 1 filter.