water treatment chemical/poly aluminum ferric chloride 1.factory price 2.broad-spectrum 3.quality guarantee 4.hot selling 2011 hot-selling water treatment chemical/poly aluminum ferric chloride 1.product name: poly aluminum ferric chloride (PAFC)2.molecular formula: [Al2(OH)nCl6-n]m.[Fe2(OH)nCl6-n], n≤5,m≤103.physicochemical property: refous or sepia powder or granular