PetSafe Drinkwell Replacement Filter Kit for the Everflow and Outdoor Dog And Cat Water Fountains, Kit Contains 3 Dual Cell Carbon Filters and 1 Foam Pre-Filter - PAC00-13192 - GUARANTEED FIT: The only filter brand guaranteed to fit PetSafe Drinkwell Outdoor Dog and Overflow Pet Fountains - FRESH WATER: Activated carbon water filter removes bad tastes and odors from water and the foam filter catches hair and debris - 50% MORE CARBON: PetSafe Drinkwell branded filters contain 50% more carbon than generic brands for better and longer-lasting filtration - EXPERIENCE: PetSafe brand has been an industry leading U.S. manufacturer of pet behavior, containment and lifestyle products since 1991, helping millions of people and pets each year