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Long dead topic I know, but since it's linked in the last issue of the magazine I thought I'd step in. The pH of the saturated and half saturated kalkwasser are both very similar, but that doesn't count for much in this situation. what you care about is the buffering capacity, which is exactly half as high for the half saturated Kalk. pH is logarithmic, but as the natural acids in your tank start interacting with the bases you reach a new equilibrium. If you took a container full of vinegar and added Kalk at 12.54 pH to it you would probably see the solution go basic faster than if you added 13.0 pH NaOH to it, because the NaOH has a higher pKOH than the Kalk does.
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