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Well, I have noticed this problem for a couple years now. Two years ago when I really started getting into SPS I could not keep up my calcium even though I did 15% water changes weekly, and this was with maybe 5 small frags. When I finally ordered a mag test kit and tested my tank it was at about 1100. After correcting my levels in the tank I noticed my tank was back down to these levels after about a month. I finally suspected the salt and tested a batch of freshly mixed salt and found that the RC was the problem. Since then I test every new bucket and in two years I have had two buckets of RC that tested to 425-450 Ca and 1300+ Mg. Not a big deal as I buy Mg and Ca in bulk now and adjust accordingly. I don't necessarily want anything from anybody but having to buy 5 gallon buckets of mag gets a little annoying. I only buy salt when it is on sale at Drs Foster and at that price I am willing to spend a little extra to get the right levels.
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