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With a Kalk reactor, the idea is to put a lot of lime into it so that as water is added automatically, more Kalk will dissolve. Only two tsp of lime will dissolve per gallon of water, and the rest remains in the reactor. Over time, calcium carbonate will form in the reactor, which will look a lot like Kalk but won't dissolve.
The only way to be sure about the potency of the Kalkwasser is to measure it. You can do that with a pH meter, with a reasonable degree of accuracy, or get a conductivity meter that measures in the 10 mS/cm2 range. You could get some estimate if you know the amount of water that has passed through the reactor. What equipment do you have for measuring pH?
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Jonathan Bertoni
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