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There are designs for degassing chambers in various places. You might contact one of the filter vendors. If carbon dioxide is the problem, that's about all you can do. Have you double-checked that pH? That's very low. I probably would try aerating a cup of water outside for a few hours, and see how much the pH rose. Also, 20 ppm nitrate is very high, and beyond the limits for drinking water, which would have me worried.
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Jonathan Bertoni
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