Double refined, high purity salt (softener salt, sodium chloride, Salt tablets) is used in softener for regeneration of the softener resins. The purity to be more than 99.5 % and to be double refined. Sea salt with solar drying is not suitable for the application. Green water treatment solutions produce high purity salt and supply in tablet form as well as powder form. GT Pure is the product name and is supplied to Green Water clients, who require to maintain long life for their equipment and softener system.