PetSafe Drinkwell Outdoor Dog and Cat Water Fountain Replacement Filter Kit Compatible with the PetSafe Drinkwell Outdoor Dog and Everflow Pet Fountains Replaceable carbon water filter removes bad tastes and odors, keeping water fresh Foam filter catches hair and debris Duo-density polyster pad catches hair and debris Using water filters will extend the life of your fountain Compatible with the PetSafe Drinkwell Outdoor Dog and Everflow Pet Fountains Replaceable carbon water filter removes bad tastes and odors, keeping water fresh Foam filter catches hair and debris Duo-density polyster pad catches hair and debris Using water filters will extend the life of your fountain Change every 2-4 weeks to maintain water freshness Call, chat or email with our expert US-based customer care specialists six days a week; They are waiting to assist you and your pet with your product needs PetSafe brand has been an industry leading US manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year