... design pumping system, including multi-stage centrifugal pump, energy recovery turbine, and variable frequency drive, making it ... Motor: 415V/380V/230V/208V/120V, 50hz/60hz, single phase or three phase5. High pressure side piping material : 316 SS6. ... quality monitor: seawater and product water digital TDS meter, seawater and product water pH meter, ORP meter. Ashcroft, Marshal, Signet, Fisher or ...