Treat your pal to fresh, clean water whenever they need it with the DOGNESS Smart Automatic Dog Water Fountain. This 2.2-liter water fountain features a triple-layer, carbon-activated filter that cleans, purifies and removes debris and odors for better tasting, healthy water. The constant upward flow also helps oxygenate water and prevent harmful bacteria buildup caused by stagnation. A built-in light illuminates the water level window and changes color when water level is low, letting you know when it’s time for a refill. Plus, the pump runs whisper-quiet for a pleasant trickle that you and your pet will love!