Purifies your dog’s drinking water in three ways The Zeus Triple Action filter was specially created for use with Zeus drinking fountains. The filter efficiently captures debris and other impurities, helps absorb foul odors, and softens your dog’s drinking water, keeping it fresh and tasty. Helps soften tap water to help prevent urinary tract diseases Helps absorb odor and other water impurities Filters out hair, food, sediment and other debris Includes 2 filters