ONLY Compatible with uahpet stainless steel pet fountain Pro (with water level window version). Package includes 6-pack replacement filters and 8-pack replacement filter sponges. 6-layer water circulation filtration system to keep water clean: Each filter is composed of ABS shell, cotton, activated carbon, hydrogen ion exchange resin, KDF, and quartz sand to keep water clean and fresh. Use Method: please soak the filter and the sponge in water for 15-20 minutes and rinse it thoroughly under water before use. Easier to Replace: The replacement filter can be effortlessly installed and removal when cleaning your pet's fountain. Depending on your pet's drinking frequency and the number of pets using the fountain, it's recommended to replace both the filter and sponge every 3-4 weeks to ensure proper maintenance of your pet fountain. Please note that this set only include replacement filters (water fountain isn’t included). This replacement filters set only for water level window version stainless steel fountain, not compatible for any other uahpet fountains or others. uahpet 6 Pack Replacement Filters & 8 Pack Replacement Filter Sponges for Stainless Steel Pet Fountain Pro (with water level window version), water fountain is not included