To stop recirculation, pumps without a wear ring must adjust their impeller and suction liner close together. This can be effective when pumping fluids with no solids; with slurries, however, the solids become caught between the rotating impeller and static suction liner, and are crushed.
Grinding these solids consumes power and wears out the impeller and liner. The millMAX wear ring stops stop recirculation, and allows for a large gap between the impeller and suction liner – eliminating solids grinding.