Yeah there's no way you'll get Mg of 1500 out of IO. I was pleasantly surprised I get 1100ish mind you, since I've spent double on the price of IO on the premium salts only to find Mg is inadequate anyhow.
The last IO I tested I got 340, 10, and 1050 for the big 3. I didn't mentally tweak on the alk number you posted but now that LSM mentions it, I agree those numbers are suspect after all.
I've kind of come to the conclusion that all test kits have some degree of suckage. I don't really know if there's an answer to that. I still buy Salifert when I can. I didn't mind Elos so much, but found the same degree of variances as with other test kits anyhow, but the real kicker was just that if you just so much as look wrong at those glass vials, they break, and unless you're lucky enough to have a spare, you're out a test kit.
LSM, what test kits are you using these days?
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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