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Question about CO2 chart

Hi everybody,

Hope this isn't too dumb of a set of questions.......regarding the famous
CO2 vs pH and hardness chart.

1.  Are the CO2 values the saturation values in water at the given

2.  How do you know that you are putting enough CO2 into the system to reach
the saturation point?

3.  Does KH in the chart refer to "carbonate hardness" (alkalinity due to
carbonates) not TA total alkalinity?

4.  Can you recommend a test kit for TA - total alkalinity?

Thank you very much

Terry Barber

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