The most widely used impeller for low to medium viscosity blending and solids in suspension applications. High efficiency design reduces power losses through shear and maximizes flow generated. Strong axial flow also allows for sufficient off bottom spacing to ensure the impeller does not become bogged in settled solids should the mixer be shut off.

Slight modifications to these impellers also tailor them to be used in applications with small gas additions. Up pumping variations are also used in combination with other impellers to maintain uniform mixing throughout the vessel at lower power inputs. The combined axial and radial flow generated by this impeller gives effective floor scouring even in open basins.