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The Calder DWEER work exchanger is the most efficient energy recovery device (ERD) ever developed. It can recover up to 98% of the energy in the brine waste stream, which is then used to pressurize raw water and reduce the energy input for the high-pressure feed pumps up to 60%. With the DWEER, the high-pressure pump does not have to be connected to the energy recovery device. This permits the use of fewer, but larger, more efficient pumps.