... 89 ferrous sulfate FeSO4 (7H2O - 90%, titanium dioxide content of p content of TiO2 than 0.75%, water content than 0. ... sulfate could replace polyaluminium, alkali, polyblend of iron and aluminium type, aluminium, hexahydrated, etc. 2, as precipitation agent: and ... cr3 +, replace expensive by sodium sulfite, aw, sulfur dioxide, etc. Advantages are not toxic carcinogenic stimulate chloride (mainly ...