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Units can be configured with a choice of 4 Impeller types:

 Standard Impeller: Suitable for small and medium solid particles, this design is the most efficient, producing the highest heads. 

Semi Open Impeller: Large and medium solid particles are transferred via the semi open impeller type providing a high efficiency with larger solid handling. This impeller type is utilised for low and medium heads.

Vortex Impeller: Utilised for the transfer of large concentrations of sizeable solids at low head. Due to the impeller being of vortex design there is less area in contact with the fluid and are consequently less efficient. They are necessary for the non clog pumping of abrasive solid laden fluids. 

Recessed Vortex Impeller: This design is used when large, solid and fibrous particles are present within a fluid.  Minimum contact is accomplished between the solid particles within the fluid and the impeller. These impeller types are preferred to avoid damage or clogging to the impeller.