The Catit Senses Triple Action Filter is a set of filters compatible with the Catit Flower Fountain and Catit Water Fountain. Activated carbon removes bacteria and chlorine odours for better tasting waterIon exchange resin softens tap water to help prevent urinary tract diseaseMesh filters out hair, sediment and debrisTriple Action FilterHelps reduce the risk of urinary tract infections – for your cats health! (This product is not designed to cure any disease or illness. ) 3 different components for clean water1. Removes bacteria and chlorine odours for better tasting water2. Softens tap water to help prevent urinary tract disease, which is a common health issue for cats3. Filters out hair, sediment and debrisFor your cats health!Removes magnesium and calcium from tap water. These minerals can accumulate in your pets lower urinary tract and lead to urinary tract diseases, which is a common health issue for cats.