Petmate Gray Replendish Filtered Auto-Watering SystemThe Petmate Replendish Filtered Auto-Watering System provide pets with a continuous flow of fresh, filtered water throughout the day. The base features Microban protection which helps keep your pet's bowl cleaner for longer. Assure your pet always has plenty of fresh water whether you're home or away. Water-cooler style Replendish Waterer is made of easy to clean, durable plastic with a clear chamber so that you can monitor the water level at a glance. Patented Microban helps prevent the growth of stain and odor causing bacteria in your pet's bowl. Protection works 24/7 and doesn't wash away, providing an added level of defense against damaging microbes for the lifetime of your pet's bowl. Microban is built into the base of the waterer and the base is made of 95% pre consumer recycled material. The bottle features a big mouth design that is easy to clean. The advanced filtration removes impurities and provides better tasting water. We've included a carbon filter that removes and reduces the presence of may volatile organic chemicals and chlorine in your pet's water. Each filter lasts about 6-8 weeks and replacement filters are available for purchase.