Salt has been processed through salt mines, or through the evaporation of seawater or spring water filled with minerals. The most important industrial products of salt are caustic soda and chlorine. It is used in other industrial processes such as polyvinyl chloride, plastics and paper piles. Of the total annual salt production of about 200 million tons, man consumes about 6% of this production only. While the remainder is used for water treatment, de-mining and agriculture. Edible salt is sold in different bodies such as sea salt, table salt (table salt), which is usually treated with iodine to reduce iodine deficiency and also contains anti-caking substances. There is also salt in many processed foods. Salt is a necessary food, and health is affected by its quantity in food.