12-28-2006, 10:54 PM
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There are a lot of ways to measure CO2. One method I use is by measuring the pH and KH of your tank, and comparing it on a chart found here http://www.csd.net/~cgadd/aqua/art_p...osage_calc.htm
. The table is on that site somewhere, I just can't find it now for the life of me. I suggest downloading the calculator and it will be there.
The other method is to test the pH of a sample of water, and let the same water sit for 24 hours uncapped and test again. If the pH has increased 1.0, then you have 30 ppm of CO2. But be careful with that, because a pH increase of .5 is not 15 ppm.