FEATURES: 1、Apply to aquariums,seafood tanks,fountain,and protein skimmer. 2、Amphibious design. Super silence. 3、Electronic frequency conversion technology,energy saving up to 60% than before. 4、High-strength ceramic shaft and wear,long servier life. Sprial propeller allows the dirt particlesize as long as 6mm. 5、No copper element,cultivate salt-water organisms safely.