I too have had issues with IO salt. I called them and they told me to send me a sample and they sent me a new bucket of salt. This was in Jan 2012 and I was getting 17 for alk.
Recently, I noticed that my Mg was dropping and I tested a batch of new salt water. It was only 1200 so that was why it kept dropping every time I did a w/c. It was a newer bucket so I scooped out half of it and mixed it really thoroughly and next batch was 1300 so it does seemto make a difference to mix it up well. Just my experience anyways.
Leanne
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