PB_Smith
Aquarium Advice Addict
I have never encountered moisture already in sealed bags. My salt for decades has poured like sugar and had zero if any moisture content. I wouldn't use a salt that arrived wet.
In general, this is a mined product with some additives. The salt doesn't change, but moisture might have an effect over certain additives. I would still use it.
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all the salt mixes I have ever seen had some amount of moisture, at least enough that if squeezed in your hand you can form a loose ball out of it.
I'm not talking dripping with moisture, but it certainly isn't cracker dry, at least not in my experience.