Relay for controlling a water pump motor I want to switch on and off a motor with arduino, used for pumping water. I need to have a idea which relay could be used with arduino.

Here is a photo of a similar motor:
Fairly cheap and quite reliable relays which operate at 5V (5mA to switch closed/open) can be had at a decent price. Mine have an upper limit of 10A, either 250VAC or 30VDC.