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Thread: CO2 Chart
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post #21 of (permalink) Old 08-31-2009, 05:35 AM
Join Date: Aug 2009
Location: Australia
Posts: 3
Question pH vs KH

Originally Posted by Hoppy View Post
If you read carefully, Chuck Gadd notes in his discussion that the equation is not valid for water that isn't "perfect".
Is it possible to have an planted tank pH 7 @ 6dKH without supplemental CO2 or non carbonate buffers (e.g. phosphates)? According to the chart CO2 would be ~18ppm, well above normal equilibrium values of 0-5ppm
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