In general I agree with process, but for less 1 micro Siemens and less 20 ppm Demi water  can be sone by strong Cation exchange followed by Strong Basic AnionExchange and a polishing strong acidic Cation exchanger. In case of having a lot of weak cations and anions in your raw water you can check  WAC/SAC followed by WBA/SBA and then SAC polisher. For Malaysia River water I found out the running cost  are lower for SAC-SBA-SAC polisher then RO system followed by mixed bed. To avoid the technical handlings problems in mixed bed you can choose after RO 1 pass system SAC-SBA-SAC polisher for > 10MegOhm*cm and < 20 ppb SiO2 DI-water. That's good enough for High pressure boilers. So final a combo system could be the solution. MOST IMPORTANT: Have a complete raw water analysis that follow RO membrane manufacturers or Ion Exchange manufacturers, BTW Don't hesitate to use the help rom IEX/RO manufacturers for process basics.

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In general I agree with process, but for less 1 micro Siemens and less 20 ppm Demi water  can be sone by strong Cation exchange followed by Strong Basic AnionExchange and a polishing strong acidic Cation exchanger. In case of having a lot of weak cations and anions in your raw water you can check  WAC/SAC followed by WBA/SBA and then SAC polisher. For Malaysia River water I found out the running cost  are lower for SAC-SBA-SAC polisher then RO system followed by mixed bed.

To avoid the technical handlings problems in mixed bed you can choose after RO 1 pass system SAC-SBA-SAC polisher for > 10MegOhm*cm and < 20 ppb SiO2 DI-water. That's good enough for High pressure boilers.

So final a combo system could be the solution.

MOST IMPORTANT: Have a complete raw water analysis that follow RO membrane manufacturers or Ion Exchange manufacturers, BTW Don't hesitate to use the help rom IEX/RO manufacturers for process basics.