Keep a dog or cat cool and hydrated, especially during warmer months, with Petmate's? Deluxe Fresh Flow? Pet Fountain. Your pet can access fresh water all day with its continuous flow or circulating oxygenated water. The waterfall design encourages pets to drink more with a constant flow of fresh water. Ideal for multiple-pet households. The automatic water bowl has a submersible pump and charcoal filter to oxygenate the water. Plugs easily into standard household outlets. Change the charcoal filter every 30 days for maximum freshness to ensure a pet's water is as fresh and clean as possible.