The commercial salt available is iodized where as the rock salt is pure from nature, is more granular, has less salty taste as you would have already noticed and is not chemically processed. It is rich in lot of minerals and if used in regular cooking as a substitute of common salt, it can control all the health problems posed by common salt like high blood pressure, puffiness in the body or the eyes, is cooling for the body, helpful in digestion, relieves gas and soothes h