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$\begingroup$ Explain what you are doing ! What is a RO system ? What is recovered at 90% ? Why do you use bicarbonate ? What is the meaning of "permeate water (gas)" ??? What is a RO membrane ? What is a feed water ? $\endgroup$– MauriceCommented Jun 17 at 19:20
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$\begingroup$ It sounds like the membrane is not rejecting CO2 and HCO3-; check the specifications. 90% is a high thruput ratio. $\endgroup$– jimchmstCommented Jun 17 at 20:12
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$\begingroup$ One is tempted to say the membrane is ruptured and RO does not work any more. $\endgroup$– PoutnikCommented Jun 18 at 5:47
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