Sodium Metabisulfite Na2S2O5 FCC/USP grade 99% 3 lb
It is commonly used in homebrewing and winemaking to sanitize equipment. It is used as a cleaning agent for potable water reverse osmosis membranes in desalination systems. It is also used to remove chloramine from drinking water after treatment.It is also used to precipitate gold from auric acid (gold dissolved in aqua regia).