INSTRUCTION: 1.Through the switch to connect or disconnect to the power,convenient and safe. 2.The built-in ultraviolet germicidal lamp can effectively kill the bacteria and algae in the water,provides a healthy environment for fish. 3.This equipment can be fixed to HQJ-500G、700G、900G、1200G、1600G upper filter pump and JP-022、023、024、025 pump.