Product Description Triple Filtration for Healing Water Guard one: high intensity cotton When resting on the floor, hair, dust and other small impurities can easily fall out on the fountain. With the highest intensity cotton, our fountain filter can effectively filter out hair, debris and sediment. Guard Two: Activated Coconut Carbon Made from coconut shell natural coco, eliminates residual chlorine and other infectious microorganisms. Purify drinking water and further improve the taste, which most intrigues our pets' interest in drinking. Guard Three: Ion Exchange Resin Drink tap water without processing can build up calcium and magnesium ions, causing calculus problems in our pets. The ion exchange resin helps extract heavy metal ions, softens tap water and protects the urinary health of our animals. Please measure the dimension before purchase! Outside diameter 125 MM Inner diameter 37MM Generally suitable for 2.0-2.5L cat water fountain, eg Aerb, DAYPET, Parner, Toozey, especially PewinGo cat fountain. [NOTICE] Not for CATIT Water Fountain Rinse before use Rinse fountain filter for 10 minutes before first use. To clean debris from coconut shell coco avoiding it falling into the drinking water. Flat side up To ensure better filtration, please put the flat side up. And please change the fountain filter 2-4 weeks once, to ensure the best filtration effect. (Higher change frequency in more dusty or multi-pet environment) Individual package Individual plastic packaging for each filter, easy to store and better for storage! Always ensure the best filtration for our cute animals drinking water! Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery Quantity: (according to the main image)