describe: Green material: This pet fountain filter uses coconut shell activated carbon, which is made of high-quality coconut shells. There are also cationic ingredients that have cleaning and revitalizing functions. Purification principle; physical purification, no side effects. Coconut shell charcoal is made from high-quality coconut shells and is activated and refined using physical methods. It has the characteristics of good adsorption performance, high strength and long use time. It can filter hair and improve the taste of water, allowing pets to drink clean fresh water all day long to keep pets healthy. Product Ingredients; Each fountain filter is made of layers of cotton, coconut shell activated carbon, and cationic water. Unlike other products, we have different options that are fan-shaped. There are two options, one is fully cationic material, one is half coconut shell activated carbon, and the other is cationic Instructions for use: To prevent the coconut shell activated carbon from falling off into the water, soak the filter in water for 2 minutes before use, and then rinse thoroughly with running water. Dispense based on how often your pet drinks water and the number of pets using the water dispenser. Replace every 2 to 4 weeks to keep water fresh Specifications: This pet water fountain filter is packaged in a box of 6 pieces, a box of 8 pieces, and a box of 12 pieces. For circular filter chips, you can choose according to your own situation Package contents: 1 piece filter