Oh, incidentally, I've used D-D before and tested Mg and came up with 900 (although now I wonder if it may have been less and I didn't realize it). I realize D-D has changed and things are better now but this is now the second "premium" brand of salt that I've been disappointed with. I think MY next salt will be .. whatever I get the best deal on.
And I test the heck out of it at first to know what needs to be adjusted on it.