Multi-stage pump for pumping various liquids

Abstract From the Canadian patent

The pump has three separate pumping stages on a single shaft driven by the same motor. Between the first and second pumping stages the liquid is diverted away from the pump to for example, a filtering device designed to remove as many impurities as possible from the liquid. The filtered liquid is then returned to the second series of pumping stages in the pump where the liquid is pumped at high pressure before again being diverted away from the pump to a treatment chamber where reverse osmosis, nanofiltration or some other process occurs. The permeate is removed from the facility while much of the solute is routed to a third series of processing stages after which it is mixed with the …