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If the water is aerated for a few hours, especially outside, it will outgas carbon dioxide if it contains more carbon dioxide than the equilibrium level with the air. The water always will have some carbon dioxide, in your situation.
Measuring the pH of RO water accurately is difficult for reasonable TDS levels. Technically, I don't remember how to do it. If the DI media was being exhausted rapidly, and the TDS out of the RO was reasonably low, the issue might well have been carbon dioxide. I have forgotten how strongly carbon dioxide ionizes in water. Is this well water?
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Jonathan Bertoni
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