HYDRATION - The dual-density polyester pad removes unpleasant odors or tastes from your pet’s water, making it fresher to circulate 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 Clean, Fresh Water Has Many Benefits LONGER LASTING - Lasting for weeks at a time, carbon filters are an affordable and consistent way to improve drinking water quality of your cat or dog COMPATIBILITY - Drinkwell replacement carbon filters are compatible with Original, Platinum, Mini and Big Dog fountains.