Petmate Zeolite Deluxe Filter , Jumbo Petmate's extended line of litter filters help to keep your kitty's litter box clean Filters minimize unpleasant odors, keeping air fresher Reduces odor up to 90 days! Designed specifically for the Petmate Jumbo Hooded Hi-Back Litter Pan Uses zeolite/charcoal particles to trap airborne odor molecules