Drinkwell Replacement Filter for Original | Platinum | Big Dog Pet Fountains, Charcoal Carbon Filter for Cats and DogsHYDRATION The duo density polyester pad removes any unpleasant odours or tastes from your Pets Water making it Fresher EXTEND FOUNTAIN LIFE The Drinkwell Replacement Filter Cartridges will prevent Food, Hair and other Large Debris from being circulated through the Fountain, making cleaning easier IMPROVE WELLBEING Keeping your Pet hydrated is one of the best ways to improve their health, for Cats and Dogs with kidney disease or cystitis Drinking