Your pets won't ever go thirsty with the ERGO Auto Pet Waterer in the house. The Pet Waterer is available in three different sizes to suit your pets' needs. The unit consists of a storage container and pet bowl with a pump that re-circulates the water from the bowl through a disposable eight-layer filter. A patented forced aeration system within the re-circulation system reduces pet saliva contamination and aerates the water continuously. Algae is eliminated, along with the risk of urinary tract infection. The Auto Pet Waterer is also designed with an anti-splash system to prevent water from getting on the floor or carpet. The ergonomically designed storage bottle comes with dual handles and a check valve. The check valve in the system prevents water from spilling when you carry the bottle. Plus, a bottle-centering device helps users place the bottle in the unit with ease repeatedly. Available in small (2-gallon), medium (3-gallon), and large (5-gallon) sizes.