This 2-pack of Cate Mate Pet Fountain Replacement Filters features two replacement polymer carbon filter cartridges optimized for water purification and flow performance. It is recommended that pet owners with one cat replace filters monthly. Features: Cat Mate Filters are embossed with "Cat Mate" and "Dog Mate" on the filter housing Includes: Pack of 2 replacement polymer – carbon filters Instructions Intended For: Intended for use with The Cat Mate / Dog Mate fountains for water purification and flow performance. Material(s): Plastic, Polymer, Carbon Color: Blue with white filter media Product Dimensions: 2-3/8 in H x 4-3/8 in W Caution: Rinse filter before installing.