Adjustable telescopic tube and water flow: waterfall effect increases oxygen levels in the water, also has an adjustable water flow. Hang on design: it starts working when hang on back filter for fish tank, it can save space Biochemical filter cotton: high density, can be used repeatedly, also clean up aquarium fish feces, create a clean environment Quiet design: super quiet pump adopts advanced technology, pump working noise is low. Waterfall effect increases the oxygen content of the water also has adjustable water flow. New oxygen injection, diving, pumping three in one design, new flow regulation function design, prevent young fish suction tube., Manufacturer: CENPEK