Used in papermaking, purifying water (water treatment agent) and also mordant, tanning powder, medicine astringent, wood preservative, firefoam, food preservative,etc.

It is grey sheets, grain or block, a little green because of FeSO4. it can make the product yellow because of the oxidation of protosalt.

25kg or 50kg pp bag (woven bag lined with plastic bag)

 20 feet container holds 25 tons, price should be calculated as 20 tons