... 5.0 Polyaluminium Chloride PAC-WPD is a new-type inorganic macromolecule coagulant with high efficiency, ... dark, the dosing volume is too small; As seen on sedimentation alum and, cloud high, the dose ... solution)3.5-5.0Ammonia nitrogen (N)% ≤0.01Arsenic (As)% ≤0.0001Lead(Pb) % ≤0.0005Cadmium(Cd)% ≤0 ... .00001Chrome(Cr +6 ) % ≤0.0005The concentration of N, As, Cd , Hg, Chrome(Cr +6 ) and other impurities ...