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Can chlorine dioxide be used effectively in place of sodium hypochlorite for prechlorination of bore well water, RO feedwater and Permeate water?

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Default ThumbnailWe recently installed new RO membranes in our system and observed that the permeate water tested positive for coliform bacteria. Is it possible in your experience that RO membranes could be damaged during installation and cause contamination of the water distribution system by bacteria and pathogens? Default ThumbnailCan chlorine dioxide be used effectively in place of sodium hypochlorite for prechlorination of bore well water, RO feedwater and Permeate water? Default ThumbnailA few weeks ago, we pickled all RO membranes in our trains with sodium metabisulfite for long term storage. Our membrane manufacturer recommended that we change the solution once the pH drops below 3. We measured a decrease in pH for the first two weeks, but then on the third week, the pH increased. Can you explain why the pH increased instead of decreasing? Default ThumbnailCan hydrogen peroxide be used effectively in place of sodium bisulfite for dechlorination of seawater RO feedwater? We are concerned about dissolved oxygen levels in the concentrate that is disposed back into the sea…

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