eep cat box odors at bay with these quality filters from Petmate. Litter Box Filter helps reduce & absorb unwanted odors in your litter box area for up to 3 months! Petmate Zeolite-Charcoal Replacement Litter Box Filter uses Zeolite/Charcoal particles to trap airborne odor molecules. Absorbs odors & keeps air clean while being nontoxic & easy-to-load. Key Benefits Traps both urine & feces odors using a combination of charcoal and zeolite particles. Activated charcoal is able to absorb and trap the odor by chemically binding to it. Zeolite has a cage-like structure and works with the charcoal to trap odor molecules for dual protection from unwanted odors. Minimizes cat box odors so you home smells clean and fresh. Each pack contains 2 filters. 1 filter will absorb unwanted odors for up to 3 months. Keeps air clean for 6 months with 1 pack of filters. Nontoxic and easy to load so you'll have more time to spend with your furry friend.