Dripping Kalk 24/7 is what is influencing your results. You need to carefully control how much Kalk is added in a given time period.
The inexpensive way to do it is to measure the amount into a container, then let it drip such that the container empties before 24 hours. Repeat with the same amount the next 24 hour period. This way, you always know exactly how much you've added over 24 hours. Measure your Ca/Alk so you know if you need to drip more or less Kalk.
If you are simply keeping a container full of kalk and letting it drip constantly, you're headed for trouble.
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