Good info there. I would say you need to stop adding the buffer as your alk is already to high. That contributes to the lower calcium levels. Perhaps look into using something like Turbo calcium to bring the levels back up .
Once you get it in balance I would use a kalk drip and the addition of a 2-part additive, {C-Balance, ESV B-Ionic }. Its added in equal parts to keep calcium and alk in line. The kalk can replace make-up water, replacing calcium at a fraction of the cost.
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Doug
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