The Diaper Genie Carbon Filter adds another layer of protection to your Complete Diaper Pail by absorbing and locking in odors. Some diaper pail accessories only work as deodorizers, but these carbon filter inserts work as the ultimate odor eliminator when paired with the Complete Diaper Pail's Double Air-Tite Clamps and the multi-layer odor blocking refill bags. Made with activated carbon, the filter absorbs and blocks odors from escaping the diaper pail to keep babys nursery fresh and clean. Easily replace the old one with a new insert every 30 days for ultimate nursery freshness.