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Set entrance equipment sewage equipment tanks, reaches the device after you start the level, float controller will contact signal transmission to the controller, power pump start inhalation in the wastewater from the sewage tank, pressurized by the volute check valve discharge outdoor. When the water level reaches stop when the water level, water pumps stopped working, complete with a working cycle. Two pumps stand each other. When the water is large, double-pump can be started simultaneously. When the water level reaches the alarm level, the device will send out sound and light alarm signals