This is a simple circuit used to control the water level of an elevated water tank. The pump controller is a step-down transformer, a 24V AC double conversion relay, two floats, and two micro switches. Regardless of the coil voltage, any available relay can be used. Of course, the rated current of the contact should be considered based on the motor power. Since the circuit works under alternating current, there is no need for rectification. The microswitches S1 and S2 fixed on the top of the water tank are operated by separate floats.