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I commented on this in the other forum where you posed the question, but to summarize, any formula that relies on calculating ppm of CO2 from the change in pH from "degassed" water to "in tank" water will fail, because we have no way to know how much CO2 is in the "degassed" water.
 

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Buffering normally means that the pH of a solution will remain the same with small additions of acids or bases. In our aquarium we use KH to keep the pH higher than it would otherwise be, but that doesn't prevent acids from dropping the pH. If I increase the concentration of CO2 in a container of water, whether it is an aquarium or a beaker, by a factor of 10, the pH will drop by 1.0, assuming that water contains nothing else that affects pH except carbonates and CO2. That will be true if the KH is 0.1, 1 or 10 dKH. So KH doesn't really buffer the water in the usual meaning of the word.
 
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