If you want accurate readings for testing salt you have to either mix up the whole box or record multiple tests from multiple samples and use stats, testing a cup here and there will always give different results. This means the results in the link are pretty useless since the guy only mixed up 500ml samples. I've been using RBS on my tank and others for quite some time and Mag levels have never been a problem so I'm sure it's fine.
Last edited by sphelps; 04-13-2009 at 05:30 PM.
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