Magnesium sulfate heptahydrate is also named mgso4.7h20, used in fertilizer,FOB price is 120usd per ton, quality is better, diameter have 1-2mm, 2-3mm .
Sodium Metabisulfite Sodium Metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as disodium metabisulfite. I