Drinkwell Avalon FiltersDescription This pack of 4 replacement charcoal filters is for the Drinkwell® Avalon and Ceramic Pet Water Fountains. Drinkwell Replacement Charcoal Filters keep your pet's water tasting clean and fresh. Each filter features a duo-density polyester pad that catches hair and debris, while the charcoal removes bad tastes and odours from the water making it more appealing t..