It takes a lot of calium to get your levels up cause your salt (IO) is very low in calcium and magnesium in the first place.
Bring up newly made up water to the appropriate levels (I recommend 10 , 1380, 430) and then you will find things are quite easy to maintain from there, especially with a fairly light load like you have.
From there you can use kalk or two part, it likely will not take much.
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