PetmateŽ Fresh Flow Replacement Filter 2 Pack is a replacement for all Deluxe Fresh Flow Pet Fountain & Fresh Flow Pet Fountain watering units only. Keep your pet's water fresh and clean with the charcoal filled filter. Replace filter every 30 days for usage by one pet.
Remove filter from package and rinse in clear water until all charcoal dust is removed. (This is normal for this type of charcoal filter.)
Place filter in reservoir by sliding in diagonally.