I just recently had a bout with a bad bucket of IO...but the problem was the opposite. The alk was really low. I have always used other salts (not IO) that were consistent but with the big tank...the budget has come more into play. I started testing and found my tank alk was really low...then I tested the freshly made water from the last bit of the salt out of that bucket and it was between 4-5. The next bucket I opened went back to the 10-11 that I was expecting from IO. I've been slowing bringing my Alk back up in my tank. Now I always check every new batch and I roll every bucket (have for years).
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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