Salt therapy or halo therapy is a well-known method for complementary treatment of some diseases in the world and is used in many countries. Iran is a very strange land that has valuable, unique and very diverse salt reserves in its heart. There are different salt deposits in Iran in different forms such as salt mines, salt fountains, salt plains, salt lakes, salt hills, etc., each of which has different properties from the other.
Salt is used in many different ways in many fields and has various applications. Iran’s largest salt hub is located in the heart of Iran, Semnan province, which is a huge salt reservoir of about three hundred square kilometers of salt storage with unknown depth; These huge salt deposits are in the form of very high salt mines, some of which sometimes reach a height of fifty meters; When man enters these mines, it is as if he were a drop in a vast ocean. This region has rich sources of industrial salt and table salt, some of which are unique in the world. Usually, the salts in the region of edible salts are very high purity and some of them with a purity of over 99% are used in the serum industry.