PetSafe Current Pet Fountain Replacement Carbon Filter. Lot of 7 packs. PetSafe’s Current Pet Fountain Replacement Carbon Filter is designed for all PetSafe Current Pet Fountains (not included), so your pet can enjoy plenty of clean water. The carbon helps remove undesirable tastes and odors while the duo-density polyester pad helps trap hair and other debris, leaving your pet’s water in impeccable drinking condition. Replacing your PetSafe carbon filter every two to four weeks can help extend the life of your fountain and pump. BRAND NEW!! (J-1)