Mainly used in Detergents, Tanning, Textile, Printing, Dyeing, Glass, Papermaking and Medicine Industry • In Bleach to dechlorinate tap water for aquariums or treat effluent from waste water treatments prior to release into rivers • To lower chlorine levels in swimming pools and spas following super chlorination • To remove iodine stains, e.g. after the explosion of nitrogen triiodide. • In bacteriological water assessment • In the tanning of leather • Often used in pharmaceutical preparations as an anionic surfactant to aid in dispersion