Cat Water Fountain Filters for 108/3.2L& 67oz/2L Stainless Steel Pet Water Dispenser Fountain Filter Replacement with 8 Sponges (8 Filters&8 Sponges)Pet fountain filter replacement Package: The package contains 8 cat fountain filters&8 sponge filters Suggestions for use: To keep the drinking water fresh and hygienic, it is recommended to replace the pet water fountain filters every 2 4 weeks, depending on the number of cats in your home. Before using the pet fountain filter replacement, rinse them thoroughly under running water and then install them in the cat fountain. Three layer circulating