3 IN 1 INSTALLATION: Our small aquarium filter can be installed in 3 ways. It can be used as a water filter to purify impurities in aquarium or can be used as an oxygen pump for water tank. Contact the air tube, it can increase oxygen of water and provide a healthy environment. ADJUSTABLE WATER FLOW 600L or H: The adjustable design helps adjust the water flow speed and provide different water flow. The oxygen tube is also designed with an ir flow control valve. Suitable for 80L aquarium. RAIN or WATER CURTAIN DESIGN: The water spray mode will present a beautiful rain or water curtain scene. Note: Avoid excessive water flow which could affect fish life. EASY TO ASSEMBLE AND CLEAN: The aquarium filter pump is equipped with a suction cup that you can stick to the wall and bottom of the aquarium. Filter element can be easily disassembled and assembled. A small brush included will help you easily clean the interior of the spray boom. IMPORTANT NOTE: The minimum water level is not less than 5cm and the suction cup can be fixed on the glass surface. Please check and clean the filter parts regularly, once a month is recommended. Filtering effect will be better after cleaning.