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Okay, to get an idea of the saturation level, you will need to add ½ tsp or so of Kalk to create a saturated solution. That'll be your reference solution. Once you measure the pH of the new Kalk solution, you can measure the output of your reactor. Each 0.3 units of pH difference between the two corresponds to a ½ decrease in concentration.
The pH of Kalk is high enough (12.54 at saturation) that your meter won't be able to measure it accurately, thus the need for the reference solution.
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Jonathan Bertoni
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