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CO2 question

I was recently reading a booklet from a German manufacturer of aquarium CO2
products & it made a number of statements that, taken together & to their
logical conclusion, would imply: IF ALL OTHER FACTORS ARE EQUAL, CO2 would
diffuse out of a body of water faster if the KH is lower (given the same
starting concentration of CO2 in solution).

So, in aquarium terms, it would be better (i.e. less CO2 loss) to have a
higher KH & maintain a higher pH, than to have a lower KH & maintain a
lower pH, to achieve whatever target CO2 level you require.

Does anyone know if this has any basis in fact?

Regards, Kevin