My two 180 lbs English Mastiffs drink tons of water, and every time they drink, they leave behind drool, pieces of dog food, and dirt in the water bowl. I purchased this stainless steel automatic water bowl from Amazon.com that keeps the water bowl full. Then I mounted it onto a shaft driven by a small DC motor set to a timer. It automatically rotates and rinses the bowl 3 times a day to keep the water fresh and clean.