The Protégé Ultra Series delivers a smooth consistent flow of water to pass through the filtration system. It provides the water flow that is vital for effectively distributing oxygen to fishes and other aquarium inhabitants. Aside from aeration and water circulation, the pump can also operate ornaments and create currents inside the tank. Extremely versatile and customizable, the HW series of external filters hold large amounts of mechanical, chemical, and biological filter material in varying combinations to provide the ultimate filtration. The result is maximum flexibility to create a unique filtration system suited for your particular needs.