It’s called salt creep, if nobody’s responded yet (only did a cursory check). Happens in salt water fish tanks too.
Thanks. Don't have a photo at the moment, but I can see the top of a crystal peeping through the solution now.
This is infinitely more successful than our last attempt.
@hugo7 started
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It’s called salt creep, if nobody’s responded yet (only did a cursory check). Happens in salt water fish tanks too.