A set of 6 premium activated charcoal and ion exchange resin water filters designed by NISPIRA compared to the part #55602. It's compatible with Catit Design Senses Fountain, Catit Flower Fountain, Catit Senses 2.0 water fountain. Catit is registered trademarks of the original manufacturer. This product is high quality aftermarket filter. Any use of the Catit?? brand name or model designation for this product is made solely for purposes of demonstrating compatibility.