... gradually. Second, the product specification product standards: GB10531-89 ferrous sulfate FeSO4 (7H2O - 90%, titanium dioxide content of p ... the original technology, low price, as the flocculant, ferrous sulfate could replace polyaluminium, alkali, polyblend of iron and aluminium ... optimal amount) dosage. 3 dosing: will melt into ferrous sulfate solution, and according to the proportion of dosage, can ...