how is table salt processed
One source of sea salt is brine, with the salt being produced through evaporation. Table salt can also be produced from rock salt, in which case evaporation is not necessary for processing. The salt crystals are processed to remove any impurities that may be present and allowed to recrystallize.
During processing, the salt may be iodized, meaning that iodine is added, and it can also be treated with anticaking agents to prevent it from clumping. Ad. Iodized salt is sold in many regions to ensure that people get an adequate dietary supply of iodine, a necessary nutrient.