I haven't tested Mag. in newly mixed saltwater. Is that what you're looking for, Gary? My results on display tank water were 1,485 when I tested on 12/2. I've never used anything but IO and I've been a little more diligent about water changes for the last few months.
Gary- Are you interested in batch #'s as well? The stuff I'm using is probably from last year's order (but I can't be sure). I'm using the 200 g boxes. I order them for the year and get delivery every August.
FWIW, I haven't had to make any adjustments to freshly mixed IO before using it.
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