The old southern solution to that was to put dried rice in the salt. It's nature's dessicant, lol. I didn't know table salt came any other way as a kid.
“The first winter living on my own in Cape Town, South Africa where winters tend to be very damp, the dampness caused the salt to solidify.”
“The old southern solution to that was to put dried rice in the salt. “
I can remember someone suggesting that to me at the time. The irony is that I subsequently ended up working, for many years, for one of the major importers of rice into South Africa.