Not only can add slurry pump impeller vanes to save energy, but also can cut the slurry pump diameter and lower the impeller speed.
When the slurry pump with too high head or flow rate, and there is no other pump can do the work, it is the time to cut the slurry pump impeller size or lower the impeller speed to lower the shaft power of the pump, saving energy cost.
And after cutting slurry pump impeller or lower the speed, you have to change a small motor to drive the pump, or you can hardly save the energy cost.