Pet fountain filter replacement:The package contains 4 cat fountain filters&4 sponge filters Compatibility: Usage Tips:Replace thePet Fountain Filter Replacement every 2-4 weeks (more frequently with multiple cats) to keep water fresh.Rinse thoroughly under running water before installation. Multi-Circulation Filter System:Activated carbon and non-woven fabric create aMulti-Circulation Filter System that filters pet hair, food residue, absorbs odors, softens water, and delivers clean drinking water.
