• Keeps your pet's water fresh and clean with PetSafe's Drinkwell Premium replacement carbon filters. • Contains 6 separate carbon compartments to improve filtration. • Double-density polyester pad traps hair and other debris. • Activated carbon made from coconut shells eliminates bad odors and tastes from the water. • Compatible with Drinkwell outdoor fountains for dogs, Everflow, Multilevel, Original, Platinum, Zen, and Mini. • Set of 3 Drinkwell replacement filter cartridges. • Rinse the carbon filter well with cold water to remove loose carbon dust. • Replace filters every 2-4 weeks. • For more information, contact PetSafe Customer Service.