... .53.5-5.0Ammonia nitrogen (N) % ≤Arsenic (As) % ≤Lead (Pb) % ≤Cadmium (Cd) % ≤Mercury (Hg) % ≤Chrome ( Cr +6 ) % ≤0.010.00010.00050 ... .00020.0010.00020.000010.0005 ----Note : ammonia gas, arsenic, lead, cadmium, mercury, chrome and other impurities quality scores are 10.0 ... ,B classes are recommended. Factory price of Polyaluminium chloride for industrial wastewater treatment