... water treatment 3. PAC free sample 4. Prompt delivery Poly Aluminium Chloride (PAC) water treatment agent 1.Character:CAS No.: 1327 ... /% ≤1.0PH(1%aqueous solution)3.5-5.0Ammonia nitrogen (N)% ≤0.01Arsenic (As)% ≤0.0001Lead(Pb) % ≤0.0005Cadmium(Cd)% ≤0 ... .0001Mercury(Hg) % ≤0.00001Chrome(Cr +6 ) % ≤0.0005The concentration of N, As, Cd , Hg, Chrome(Cr +6 ) and other impurities counts ...