Providing a healthy source of drinking water is key to keeping your pet healthy and hydrated - and you can ensure your pet's drinking fountain offers the best water quality possible by replacing the filter at least once every month. This pack of two replacement polymer-carbon filter cartridges is here to keep water clean and safe. What's more, the filters in pet fountains will trap dirt and fur and any other nasties, and remove any chlorine and unpleasant odors to keep your water quality in perfect harmony. Replacement filters for your Cate Mate and Dog Mate fountains 2 Polymer-Carbon filters per package Each filter cleans for up to 4 weeks. Successfully filters out floating debris and pet hair For use with all Cat Mate and Dog Mate Fountains These replacement filter cartridges are suitable for soft water, but if you have hard water in your area, our 3-Stage Filter Cartridges will be perfect for you!