Carbon Filter for Trusens Air Purifier is a dependable option for Canadian businesses, schools, facilities, and home offices. Use it to maintain compatible air purifiers in offices, classrooms, reception areas, breakrooms, and home workspaces where cleaner indoor air supports comfort and productivity. Carbon Layer replacement. The activated carbon layer removes certain gases and odors from the air. This layer is what needs to be replaced on the HEPA drum filter. For best results, replace carbon layer filter every 3 months. Change indicator light i. Order it for workplace maintenance, facility supply rooms, and commercial purchasing programs across PEI and Canada.