The Trekkopje Desalination Project in the Erongo Region, Namibia utilizes high-efficiency TM820F400 and TM820E-400 membrane elements produced by Toray Membrane USA, Inc. a wholly owned subsidiary of Toray Industries, Japan. These membranes elements meet the product water requirements of less than 750 milligrams per liter (mg/L) salinity and less than 1.75 mg/L boron while operating at relatively low membrane feed pressures. The process also uses PX Pressure Exchanger energy recovery devices (ERDs) by Energy Recovery, Inc (ERI) to reduce the duty of the high-pressure pumps. These devices seal the high-pressure portion of the process, making the high-pressure pump flow rate and the membrane recovery rate independent and adjustable when feedwater and process conditions change. Advanced ERDs in combination with high-efficiency membranes reduce process energy consumption and cut operating costs compared to legacy SWRO processes.