b'Wellness MineralsPotassium Chloride & Sodium Chlorideare both salts, these salts create thesaline solution that in turn produces Chlorine when it passes over the Chlorinator cell. Magnesium Chloride on its own does create a saline solution,but it is not as effective as Potassium Chloride & Sodium Chloride. Sodium Chloride is by far the preferred choice when creating a saline solution to produce Chlorine effectively & efficiently. Compliment this with PoolMagic Wellness Minerals to create a mineral pool.31'