Product Description Set of 2 Catit Dual Action Fountain Filters for use with the Catit Stainless Steel Drinking Fountain (50023) and Catit Fresh & Clear Fountain (50761). This premium quality filter collects large particles and debris, helps reduce odors and absorbs impurities. The Dual Action filters are of Catit certified quality and are guaranteed to safely and optimally purify your cat's drinking water for approximately 30 days. After 30 days, filtration effects will start to gradually decrease. Replace your Catit Dual Action Filter every month, or sooner, if the filter is visibly saturated. Catit is focused on creating cat enrichment toys for all cats especially indoor cats. Catit offers a wide variety of products including interactive cat toys, cat water fountains, cat trees, cat scratching posts, cat furniture, cat toys, cat litter, cat litter mats, cat litter box with lid, cat litter deodorizers, cat brushes, cat food and treats, cat dishes, dry cat food, cat food bowls, wet cat food, cat bowls, cat puzzles, cat grass, cat scratchers, cat towers, cat food mats, cat feeders, catnip, cat harnesses, cat leashes, cat collars, cat beds, cat litter boxes, cat accessories and other cat supplies. Cat toys for indoor cats and other Catit products encourage a cat’s natural foraging and hunting behaviors. Set Contains: 2 replacement filters