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Can I raise the pH of the EDI system feed water with caustic to eliminate the CO2?

April 26, 2017caustic CO2 EDI Eliminate feed pH raise system water

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Can I raise the pH of the EDI system feed water with caustic to eliminate the CO2?

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pH adjustment has to be done in the feed to the RO system to improve the EDI performance. Raising the pH of RO permeate will not improve the EDI product water quality. Raising the pH before the RO allows the RO to remove the CO2 as bicarbonate, preventing the CO2 from reaching the EDI.