To help protect your pet from urinary diseases, they must always have access to safe and healthy drinking water. Continuous access to and supply of drinking water means better hydration and prevention of urinary diseases. Introducing, PETKIT Replacement Filter 3.0 for Eversweet Solo, 2, 2S & 3 Drinking Fountain, these are lightweight and circular in shape allowing them to conveniently fit right into your PETKIT Ever sweet drinking fountain device.