I assume you've double checked the test kit....
I don't use that method of Ca/Alk supplementation, but it is obvious that there are only two variables in play...
1) the concentration of the mix (if the supplier changed something, how would you know?)
2) the amount you add over time.
So..you can measure the volume that the pump is adding over time, so you know is unchanged.
You have no way to measure the concentration of your mix. You need to find a system that will enable you to check on the concentration of your mix. It won't tell you if this particular batch is wrong, but it will save you next time something goes off. Maybe you can dilute a sample 10:1 with RO and use your test kit to measure Ca/Alk/Mg. Maybe you can get a SpG reading?
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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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