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**To**:**Aquatic Plants Digest Messages <Aquatic-Plants at actwin_com>****Subject**:**CO2 Tables -- or - How to save money on CO2?****From**:**"S. Hieber" <shieber at yahoo_com>**- Date: Sat, 6 Jul 2002 07:45:28 -0700 (PDT)

Two formula are profferred for calculating CO2 levels from KH and pH values -- there might be more but I only know of two (not counting algebraically equivalent recastings): 12.839*KH*10^(6.37-pH) 15.664*KH*10^(6.37-pH) For an example, at a KH of 5.5 and a pH of 6.8, the former formula indicates a CO2 level of 26 ppm, while the latter llisting indicates a level of 32 ppm. If your aquarium was running at either 26 or 32 ppm of CO2, I doubt that you would see much difference in plant growth -- especially given all the other things that affect plant growth. Still, I am disinclined to call the difference in CO2 values negligible or insignificant; it's roughly a 20% variance. That's okay for budget work but one expects chemistry to be a bit more precise. I have read some aquatic gardeners' complaints that the tables must be wrong because the useful levels of CO2, in practice, are much higher/lower than the table indicates. This could be due to any of several factors. Perhaps one of the factors is using an slightly inaccurate chart. Anyone care to reconcile the differences or point out my misreading of the formulas? I suspect that, at most, only one of the formulas is correct. I am curious which. Maybe one should pick the chart that saves the most money on CO2 ;-) Scott H. __________________________________________________ Do You Yahoo!? Sign up for SBC Yahoo! Dial - First Month Free http://sbc.yahoo.com

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