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Old 02-08-2019, 12:01 PM   #6 (permalink)
hoppycalif
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Default Re: I Must Be Doing Something Right

It can be accurate to rely on the change in pH to determine the change in ppm of CO2, but it isn't accurate to use the combination of KH and pH to determine actual ppm of CO2, unless the water involved has nothing dissolved in it that affects pH except CO2 and carbonate ions. Aquarium water doesn't qualify.
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