... ferrous sulfate FeSO4 (7H2O - 90%, titanium dioxide content of p content of TiO2 than 0.75%, water content than 0.75 ... the flocculant, ferrous sulfate could replace polyaluminium, alkali, polyblend of iron and aluminium type, aluminium, hexahydrated, etc. 2, ... as precipitation agent: and the formation of sulfide, phosphate deposits, thus removing sulfide, phosphate, sulfate, with ...