EASY INSTALL: Our simple suction cup design allows the filter to be fitted to the side of the cat water fountain for continuous filtration MAKE YOUR FOUNTAIN LAST: A properly maintained carbon filter keeps cat hair and debris out of the pump system, maximizing the life of your fountain MULTI-PACK: Shedding season? Keep fur out of your kitten’s water by keeping extra filters on hand Compatible with Pioneer Pet’s Swan Pet Drinking Fountain, or comparable running-water fountains