Abrasion inside the wet end
Sand and silt travel through the stage assembly with the water. Repeated contact gradually wears impeller and casing surfaces.
What changes in service
Wear can reduce consistent discharge and make the pump work outside its intended condition. Grit can also affect bearings and bushes.
Practical selection
Where abrasive water is known, an abrasion-resistant impeller material such as SS410 can help the wet end retain efficiency for longer. Installation and bore development still remain important.