【Compatibility】: The replacement carbon filters for cat water fountains are compatible with 1/2 gallon, 1 gallon, 2 gallon, Butterfly, Avalon, Pagoda, Seascape, Sedona, Seaside and Creekside pet water fountains; 【Three-Layer Filtration】: This replacement filter is made of a layer of cotton and activated carbon. Removes hair, dirt, odors and other impurities, so that the water always tastes fresh and clean; 【Pre-filter sponge】: The sponge can prevent dirt from clogging and damaging the pump, thus extending its life; 【Replace the filter regularly】: Soak the filter in water for 5 minutes before use and rinse it thoroughly under running water. Replace the cat water dispenser filter every 4 weeks in summer and every 4-6 weeks in winter to ensure clean drinking water. If more pets use the dispenser, it is necessary to replace it more often. 【WHAT YOU GET】: The package includes 6 packs of replacement filters and 6 packs of foam.