... gradually. Second, the product specification product standards: GB10531-89 ferrous sulfate FeSO4 (7H2O - 90%, titanium dioxide content of p ... change the original technology, low price, as the flocculant, ferrous sulfate could replace polyaluminium, alkali, polyblend of iron and ... of sulfur wastewater treatment textiles. 3, a reductant, ferrous sulfate is strong, can be the following proportions of ...