Salt was used as a currency, being traded in equal weight for gold. It was said to be pure because it could preserve food. Because it was pure, it was suspected to keep demons away, like Holy Water.
In the show it is used in shotgun shells which are shot at the ghost (demon, shifter, ect.) and it dissipates them for a short period of time, but it does not kill them. Salt rings are put around people or objects to keep the supernatural out as well as salt lines, which are put in front of windows, doors, and mirrors to keep them out of homes.
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