1. Ensure that the product is powered off.
2. Turn off the plug on D position, and connect connector and hose on C position to D position.
3. Turn the control valve handle to the backwash position and turn on the power supply, until the water is clean.
4. Disconnect the power supply. Remove connector and the hose, connect them together in C position，connect the other end of the tube to the pool, and lock it with the hose clamp.
5. Install the plug on D position.