Rock salt comes from oceans that dried up tens or hundreds of millions of years ago. Like common salt, it is not refined and present in its pure crystalline form. During the refining process of salt, many harmful chemicals are added to it to prevent salt from getting soggy. Rock salt is free from such chemicals therefore it can be consumed without having a side effect. Rock salts have many health benefits. EcoMandi products are Certified Organic & contains no artificial additives.