I'll add my $.02 to say that my experience with adding Kalk overnight has taught me that this will work....to a degree... I've found the Kalk in my reactor is effective for about 2 weeks, then I have to replace it with new Kalk. You should be able to measure the pH of the Kalk at something like 13+.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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