I also use a JBJ ato which automatically stops running after a few minutes if the float valve gets stuck. This prevents kalk disaster. I do get varying evap rates throughout the seasons but I find that I don't get any KH changes using a lower concentration of kalk. My ca reactor is doing most of the work anyways and the kalk is just keeping my levels rock solid.
I just dump the kalk in and forget about it.
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-Mason
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