Also recommend the books by Calfo and Borneman (and actually had them both out this morning looking into Elegance).
Had my reactor for a while now and biggest thing I can say on it is it will maintain the levels but not really raise them very well. When I first set it up tried driving my Ca up with it but just ended up raising my Alk at a higher rate, though could be was low on Mg. My pH is on the lower side (8.1) but don't think I'll be trying the kalk to compensate.
Good cost on Ca and Mg supplements from littlesilvermax.
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