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Litter Box Filters help reduce and absorb unwanted odors in your litter box area for up to 3 months! Arm & Hammer Universal Filters are double the odor and moisture protection combining Natural Charcoal and Zeolite. Replacement filters use Zeolite/Charcoal particles to trap airborne odor molecules. Absorbs odors and keeps air clean while being nontoxic and easy-to-load. Filter designed to fit both Large and Jumbo Litter Pans.