Symptoms

• Regular clogging of the pipes downstream the screen

• Finding inappropriate materials in the pump impeller shown by high electrical input and unusual noises

Main causes

• Solids removal not effective

• Unsuitable pumps

• Incorrect piping design or installation

Investigations and analyses

• Check the presence of solids in the water flow downstream the screen

• Check the pump water flow

Remedial actions

• As temporary solution reverse the pump rotational movement

• Modify the suction pipe setting up a protection barrier

• Replace the pump

• Modify the solid removal system upstream