I'm still puzzled as to why this imbalance occured. The STN wasn't severe enough (I didn't lose masses of corals) to radically reduce Alk consumption. The STN seems to continue (I fragged a couple of pieces to save some SPS). Still, for over a month I seemed to have dialed my levels with equal Ca and Alk solution additions on top of the Kalk addition at a fixed rate. That's why I am so reluctant to take the kalk offline.
What I would like to know is why, all of a sudden, Alk levels started to increase after more than a month of the all the parameters being balanced and steady. Has anybody else experienced this?
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