Perfect Match: Only compatible with uahpet cat water fountain. Premium 6 Pack: The pack includes 6 pack pet fountain replacement filters and 6 pack replacement filter sponges. Fresh & Filtered Water: Each filter is made of eco-friendly shell, KDF, ion exchange resin, quartz sand, coconut shell activated carbon and cotton. They can filter hair, heavy metals and improve the taste of water so that pets can drink. clean and fresh water all day long, which helps increase water consumption and reduce the risk of urinary tract infections. RECOMMENDATIONS: To prevent coconut activated carbon dust (which will not harm your pets) from leaching into the water, please soak the filter and sponge in water for 15-20 minutes and rinse them thoroughly under running water before use. EASY TO REPLACE: Easily removed when cleaning your pet fountain. Depending on how often your pet drinks and how many pets use the fountain, please replace the filter and sponge every 3-4 weeks to properly maintain your pet fountain.