SIZE: 5.5 inch in diameter, 0.47inch in thickness. Only Compatible with Catit Water Fountain（Catit Flower Fountain and Catit Design Senses Fountain）！ They have a hard plastic bottom and they are not suitable for other brands of fountains. Perfect Filter: provide you fantastic way to make kitty/dog water pure with ease, your pet will drink far more water from fountain than regular. Triple Filtration - Our triple action filters contain 3 different compartments: the ion exchange resin softens the tap water, the activated carbon removes bacteria and odors, and the cotton mesh filters resist any sediments the tap water might have. Easy to Use: please rinse the replacement filters with water thoroughly before use to remove any excess or loose charcoal dust. It is a great deal to purchase these 10 packs water dispenser filters at this low price, which can ensure you long time use. Notice&Tips: change a new one filter after nearly month of using is required for keeping water running fresh and clean.