Petmate Replendish & Mason Charcoal Filter Replacements 3 Pack offers a practical dog feeding accessory option for pet parents. Charcoal replacement filter help to remove impurities in Petmates Replendish gravity Waterer. External polyester material captures sediments while the internal charcoal materials help to control chlorine + odor. Shop Petmate Replendish & Mason Charcoal Filter Replacements 3 Pack and other dog feeding accessory options at Uncle Bill's Pet Centers. Uncle Bill's Pet Centers helps Indiana pet parents find trusted pet supplies, food, treats, toys, grooming essentials, and everyday care products for dogs and cats.