Black ritual salt has a long tradition in HooDoo and Santeria as a magical tool. It is commonly used to drive off unwanted guests, remove negative energy from your property, Protect you from outside influences, and prevent unwanted peoples and energies from returning.
Black salt differs from traditional blessed salt in that while it does protect the home and properties, it is mainly used to drive off entities and people. This is more of an active type of protection then the straight up protective qualities of Blessed salt. Please note use of Black Ritual Salt against entrenched powerful entities can be dangerous.