Randy Holmes-Farley
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Question: I run kalkwasser in my ATO but somehow my alk got up to 14. If I switch to regular RO water for top off and dose mag and cal will my alk decline?
Yes, but I cannot see that likely being needed. For kalkwasser to have raised alk it MUST have raised calcium proportionally, and if you dose nothing, you should get back close to where you were previously.
Let's just ignore magnesium for now since testing is typically less useful than one would like (e.g., often inaccurate), but what calcium level do you have?