I agree, it's the humidity in the room. Mine used to do that too, the top layer would get almost rock hard. I thought I was sealing the lid tightly too.
But now I use a small hammer to give it a couple of whacks to seal it. No problems since. (of course I need to give it a couple of whacks the other way to open it each time).
BTW, how are you mixing it? I have a powerhead in my change water tub that's on 24/7, so even when I had chunks, they would dissolve within a few hours.
Quote:
Originally Posted by Delphinus
Exposure to humidity maybe? ... my salt gets like that towards the end of the bucket but usually still dissolves for me if I break it all up. Usually the stuff under the crust is still fine too.
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