Well, salt definitely keeps demons out, so I imagine that the rock salt rounds at least slow demons down, and without too much damage to the host. They also used them on demons in Jus In Bello, if I remember correctly.
I seem to recall that salt in general keeps demons out, same as a ghost. Unless you are a YED class of demon, anyway :)
Also, it's supposed to sting or something, like holy water. I remember the question came up as to why/how Ruby would be able to stand eating salted fries for that very reason.
Well, I know for sure they kept demons locked inside a closet in Devil's trap by pouring salt down around the door. I don't remember specifically anything demonic in family remains because if I recall correctly they thought the girl was a ghost.
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Also, it's supposed to sting or something, like holy water. I remember the question came up as to why/how Ruby would be able to stand eating salted fries for that very reason.
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