With a free-flowing stream of water, the Whisker City Small Pet Fountain continually aerates your pet's water with healthful oxygen. Pets are instinctively drawn to moving water which offers healthful benefits by encouraging them to drink more water. A charcoal filter removes large particles and bad tastes and odors, giving your pet the best possible way to stay hydrated. The combination of charcoal filter and oxygenated, continuously moving water keeps your pet's drinking water tasting fresh. The operation is nearly silent and comes with flow control.The unit completely disassembles for cleaning and is dishwasher safe. Includes 5 new filter cartridges. Barely used.