GUARANTEED FIT: The only filter brand guaranteed to fit the PetSafe Drinkwell 1/2 Gallon, 1 Gallon, 2 Gallon, Butterfly, Avalon, Pagoda, Seascape, Stainless Multi-Pet, Sedona, Seaside and Creekside Pet Fountains | FRESH, FILTERED WATER: The replaceable foam filter catches hair and debris, keeping your cat’s water clean | PROTECTS PUMP: Foam filter helps extend the life of your fountain pump by catching hair and debris before it reaches the pump | EASY TO REPLACE: Easily removes when you clean your pet’s fountain. Replace the foam filter every 1-2 months to properly maintain your pet fountain | QUALITY GUARANTEED: PetSafe brand has been a trusted global leader in pet behavior, containment and lifestyle innovations for nearly 30 years; we help pets and their people live happily together