PetSafe Drinkwell Replacement Carbon Filter - 6 PackBrand: PetSafe Features: Compatible with PetSafe Drinkwell Original, Platinum, Big Dog, Multi Tier, Outdoor Dog, Mini, Everflow and Zen Pet Fountains Removes bad tastes and odors from the water, keeping it fresh Activated carbon water filter made from coconut shells Change every 2 4 weeks to maintain water freshness PetSafe Drinkwell branded filters contain 50% more carbon than generic brands for better and longer lasting filtration Fit securely in