I used to use both Kalk and Calcium reactor, but after starting zeo, the main guy on the zeo forum recommended that I cease using the Kalk reactor because the Kalkwasser has binding properties for P04. I have since taken it offline and my ph sits a little lower constantly, but everything is still growing fine. I'm not sure if you're a zeovit user, but this was the info I got from the zeo forum.
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