Scope of Application: This water fountain filter is compatible with 1L/2L/3L pet fountains. Compatibility for PewinGo, NICREW, Parner, Aerb, Toozey, Omasi, Bonve, Pedy, DADYPET, Wilktop. * Note: Its diameter is 12.5 . Not suitable for "Cat ti" fountain.Health and Hygiene: The fountain filter can improve the taste of water and encourage pets to drink more water, promoting metabolism and reducing the risk kidney stone or urinary tract disease in animals. It rejects hair, viruses, bacteria, trace elements, antibiotics, etc.Activated Carbon: Fountain filters it is made of high quality activated carbon, which makes the cat fountain smell fresh and dogs, which can effectively filter animal hair and dirt. Each fountain filter is individually wrapped for you to store it better and maintain optimal results.Thicker PP cotton: The thickness of the cat fountain filter core exceeds 0.3 and fine hair is filtered out . The frequency is lower than the ordinary filter. We recommend changing it every 3-4 weeks for fresh water. Easy to Use: Cat water fountain filter is easy to install, use and clean. Note: Before installation, you must rinse the new filter thoroughly. When cleaning the filter, please do not use detergent, please wash the surface dirt with water.