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[AGA Member] CO2 concentration in Hard water

Well In addition to my previous question I am quoting this one from the Red Sea Carbon Dioxide test lab.
"Carbonate hardness (KH), Is yet another factor that effects the concentration of CO2. Hard water with 
a  high KH can hold more CO2 than soft water. While it is essentially true that hard water with low PH holds the largest amount of CO2 In practice we can only use the values most suitable for plants, which are PH 6.4-7.2d KH.

Do they have a point here ???


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