I find Kalk a pain in the butt because the tank always seems to vary the amount it is getting topped up. You can just add the kalk to the RO in your ATO. I think I had started on the careful side with 1/2 tsp per gallon. Try something like that, and test daily until you figure out where to keep it. It's a pain in the butt to dial in.
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~ Mindy
SPS fanatic.
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