WIDLY SUITABLE Our pet foutain filter replacements is with the diameter of 12.7cm/5.0inch which suit most pet fountains with the capacity from 1.6L to 2.6L.SUPER PURIFICATION Each fountain filters is made of cotton layer, coconut shell activated carbon and cation. Different from other products, we have different choices, which are sector-shaped. There are two choices, one is all cationic material, the other is half coconut shell activated carbon, the other is cationicGREEN MATERIAL This pet fountain filter uses coconut shell activated carbon,High-quality coconut shell is used as raw material.In addition, there are cationic components, which have the function of cleaning and activation, and belong to the green purification methodHOW TO USE In order to prevent coconut shell activated carbon from falling off into water, please soak the filter in water for 2 minutes before using, and then rinse it thoroughly under running water.Depending on the frequency of your pet's drinking water allocation and the number of pets using the water dispenser. Replacement every 2 to 4 weeks to keep the water freshSPECIFICATION This pet water fountain filters is packed in a box of 4 pieces, a box of 8 pieces and a box of 12 pieces. For circle filter chip, you can choose according to your own situation.4 Packs Pet Fountain Replacement Carbon Filters Designed for most pet drinking fountain. High quality activated carbon filters keep water clean and fresh, encourage pets to drink more. NOTES:1.Replacing Charcoal filters every 2 to 4 weeks to keep the water clean.2.Replace more frequently if multiple pets using the fountain, rinse filter with water thoroughly before use.3.A small amount of carbon dust may be released for the life of filter which is not harmful to your pet. SPECIFICATIONS:Material: Premium Active CarbonColor: WhiteSize: 5.0 inch / 12.7 cmPackage included: 4 x Carbon Replacement filters