What does carbonate hardness mean in practice?
Is the conventional part of hardness corresponding to alkalinity in the range associated mainly with calcium and magnesium bicarbonates.
When does it matter?
In aquariums, KH is sometimes equated with alkalinity, which does not always correspond exactly to the share of hardness cations.
Which solutions are related to it?
The method to be used is selected and the result is interpreted together with GH, pH and alkalinity, without automatic exchange of terms.