TruSens - Replacement Activated Carbon Filter VOC Filter Drum. This filter with 3 layers of activated carbon pellets provides an unparalleled level of protection against unwanted odors in your home. The 3-layer activated carbon filter is specifically designed to combat common cooking and cleaning odors and reduce volatile organic gases (VOCs) such as ammonia, acetone, and formaldehyde in the air. It is compatible with the Odors & VOC HEPA filter drum. To maintain the optimal performance of your air purifier, it is recommended to replace the Odors & VOC activated carbon filter every 3 months (depending on usage duration). This activated carbon filter is a replacement part for the Odors & VOC HEPA filter drum. The replacement indicator on your air purifier will light up red when the filter needs to be changed. For best cleaning results, it is recommended to replace the Odors & VOC activated carbon filter every 3 months (depending on usage duration). Ideal for combating odors and volatile organic gases (VOCs). Package includes: 1 x activated carbon filter. Only the mesh pre-filter is washable.