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Freshwater CO2 Level Calculator

* Special thanks to Boomer from www.reefcentral.com for his help.

This calculator estimates the concentration of carbon dioxide (CO2) in a freshwater aquarium given a few relevant parameters. Note that there are a multitude of approaches to performing this calculation that vary significantly in complexity and accuracy. The approach recommended by this calculator is Millero, 2002. However, Hopea, 1992 and Tucker, 1984 (as presented in Table 2 of Wurt, 1992) are also presented as options as they are so commonly used in the aquarium hobby.


 pH Units


Calculation Approach:

CO2 Level:

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