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