Van Ness Air Filters for CP6 amp CP7For use with Van Ness enclosed cat pans this zeolite air filter helps remove offensive odors often associated with cat litter pans from the airMade of Zeolite for maximum odor control Zeolite is a natural mineral that is able to absorb ammonia odors Fits CP6 amp CP7 One filter lasts for 3 months of use6 12 x 4 716 x 316 thickOther products from PetCareRx