Multi-Stage Pump

“A multistage pump consists of two or more impellers stacked on the same shaft and driven by the same motor. Each impeller boosts the pressure of the water by a given amount, so the more impellers the greater the pressure discharged. The flow stays the same, however many impellers are added. (a multistage pump is like connecting pumps in series).
This gives the output a higher pressure:flow ratio than other types of pump, so it’s ideal in applications where a smaller amount of water is needed but a larger amount of pressure is required to get it there.
“