and presence of oxidizing agents was confirmed with and without the use of the pressure reducer by the lack of formation of red ferric oxide and formation of the same with and without the use of the pressure reducer the measurements were obtained from an orp monitor 200 positioned in line with second pass ro permeate 192 ro treatment stage 160 concentrates any residual dtc from water pretreatment stage 132 into first pass retentate 172 if desired or required by environmental regulations post treatment stage 174 may employ an oxidizing agent or process 178 to neutralize the residual dtc prior to discharge of first pass retentate 172 into a sewer or a npdes type water shed 179 in compliance with epa regulations suitable oxidizing processes or agents include ozone aeration towers air or oxygen diffusers inductors or chemical oxidizers with reference again to fig2 second pass permeate 202 is typically degassed by vacuum degassifier 204 and conveyed by pump 206 through an oxygen monitor 208 and then to storage tank 212 having a gaseous nitrogen environment 214 supplied from nitrogen source 216 post treatment stage 120 continues by employing pump 218 to convey product water 202 through silicon and conductivity analyzers 220 ion exchange.