An impeller is the only moving part of most water pumps and comprises of a set of paddles situated on the top of a cylindrical magnet placed over a fixed central shaft.
The electrical current produced inside the sealed portion of the pump causes the magnet to spin, and the paddles to move water through the pump. Impellers must be regularly maintained to ensure the optimum efficiency and long-life of the pump.
Over time, debris, bacteria and algae will build up around the impeller, restricting its turning ability, and placing undue stress upon the pump. The impeller should be easily accessible and should easily slide off the shaft where it can be carefully cleaned and placed back into position. Ideally, this should be done on a monthly basis.