REPLACEMENT FOR GRAVITY WATERER: Charcoal filter is a direct replacement for the Replendish & Mason Gravity Waterers. Charcoal filter's external polyester material captures sediment to keep water clean for cats & dogs. CONTROL CHLORINE & ODOR: Includes 3 filters. Internal charcoal element controls chlorine levels & odor to provide clean, fresh water for pets. Filters last from 6 to 8 weeks. Filter straps ensure a secure fit into the gravity water bowl. FOOD & WATER: Keep pets fed with fresh food & water with a variety of our products. Check out our airtight dry food storage containers, bowls for kennels, gravity water bowls, automated food bowls & travel accessories. Petmate: For over 50 years, we at Petmate are passionate about our dogs, cats & furry friends in general. Starting with the very first dog kennel, we've produced plenty of eco-friendly products that pets will love. JUST FOR PETS: Petmate makes a variety of pet products for dogs, cats, chickens & other small furry friends! Check out our brands such as Aspen Pet, Arm & Hammer, Booda, Chuckit!, Jackson Galaxy & more!