Petmate Replendish Gravity Waterer w/Microban AUTOMATIC REFILLS: Pet water dispenser's gravity flow technology slowly dispenses fresh, filtered water, prolonging time between refills; the bottle is easy to unscrew from the cat and dog water bowl for easy refills BETTER TASTING WATER: Petmate's Replendish dog and cat water bowl encourages pets to drink more with a continuous supply of fresh, filtered water STAYS CLEAN LONGER: Petmate's cat and dog waterer features Microban Antimicrobial Product Protection to help prevent the growth of stain and odor-causing bacteria in the base FOR BUSY PET PARENTS: For pet parents with busy lifestyles, the water bowl dispenser for dogs and cats allows pets access to plenty of fresh water OUTDOOR USE: For convenient use as an outdoor dog bowl, this pet water bowl allows pets quick access to water during playtime in the backyard FOR PETS LARGE AND SMALL: No matter their size, pets can enjoy the benefits of this automatic water bowl for dogs and cats, available in four capacities ranging from  gallon to 4 gallons SAFELY MADE: Petmate's automatic dog water dispenser features a BPA-free plastic base and bottle for your pets safety PETMATE REPLENDISH CHARCOAL FILTER: One charcoal filter included with the Replendish pet waterer; replacement filters available for purchase separately