1.Compatibility: Cat Fountain Replacement Carbon Filters are compatible with 1/2 Gallon, 1 Gallon, 2 Gallon, Butterfly, , Pagoda, Seascape, Sedona, Seaside and Creekside Pet Fountains; 2.Three-layer Filtration: This replacement filter consists of a cotton layer, activated carbon. It removes hair, debris, odors and other impurities so that the water always tastes fresh and clean; 3.Pre-filter Sponges: Sponge can prevent debris from clogging and damaging the pump, extending its working life; 4.Change the Filter Regularly: Please soak the filter in water for 5 minutes before use and rinse thoroughly under running water. Replace the filter once in 4 weeks in summer and once in 4-6 weeks in winter to clean drinking water. More frequent changes if more than one pet is using the water fountain;Comprehensive purification to improve water quality. To reassure owners and make pets happy with their drinks. 5.Multi-Filtration System:Composed of a cotton layer, activated carbon:Cotton layer stops hairs and debris;Activated carbon removes odors and make the water clean and tasty; Colour:Photo Color Material:Non-woven fabrics Specification: A: 6 pcs Package Contents: 6 x Water Fountain Filters 6 x Replacement Foam Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.