Catit Flower Fountain Replacement Filters- 2 Pack Set of 2 dual-action water softening filters for use with the Catit Flower Fountain Helps remove chlorine odors for better tasting water Contains ion exchange resin which softens hard water by eliminating magnesium and calcium Longer lasting filter requires less frequent changes than conventional filters Contains active carbon which absorbs water impurities such as debris, food, hair and sediment