An impeller is a small but important part of a pumping system. It looks like a little three-dimensional propeller. It draws liquid, mainly water, toward it before expelling it through an outlet pipe. Impellers fall into two classes: single and double suction. Single suction impellers pull water from one side, while double suction models attract water from two sides. Impellers are used in pumps for swimming pools, jet skis, outboard motor boats, washing machines and sump pumps. They tend to need replacing when they cannot revolve due to being clogged with dirt, hair and other debris.
Switch the pump off and remove the plug from the electric socket. Take the pump out of the sump pit.
Remove the screws from the base of the pump.
Unscrew the impeller casing.
Remove the impeller and examine it. If it shows signs of corrosion, replace it with a new one. If it is just clogged, wash it thoroughly under a faucet.
Return the impeller to its casing and secure it.
Put the pump base back and screw it down tightly.
Put the pump back into the sump pit and reattach the outlet pipe.
Turn on the pump and see if the impeller is working. Check that the water level is decreasing.