SAFETY – This pump is fully submersible with epoxy sealed motor. Each product has been submerged in water and tested with super high voltage to ensure the safety. DOUBLE OUTLETS, ADJUSTABLE FLOW DIRECTION – The double outlets provide more even flow in the tank. A directional elbow is configured for you to adjust the flow direction at ease. AERATING & FILTERATION WATER- Oxygenation is very important to your fish. This pump comes with air venturi and air tubing to increase oxygen supply in your fish tank & can be use for Top Filter MOVING WATER- Your fish will have a more active life! This pump creates a nice underwater current that will give your fish to swim against! In the meanwhile, the moving water will bring fish excrement to the filter for a healthy environment in the aquarium. HELPING HEATING – The powerhead moves water around the tank so that the heater keeps working till the water in the whole tank reaches the ideal temperature to avoid “cold spot” in your tank. KIND REMINDER – If your tank is very large, choose 2 pumps! Place a pump at both the corners at the back side. This will greatly improve the water circulation and oxygenation in your tank!