If I used the Kalk I could never keep my numbers on the high end but they stayed in an acceptable range. I think I just did not have enough evaporation. With the 2 part I can keep it on the high end of the acceptable range much easier.
I have had good success with Randy's Two Part Solution, cheap and easy. I just a bit to the sump every night, not a big deal.
A dual dosing pump is nice, but they don't come cheap either.
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