... Substance %,≤0.6PH Value(1% water solution)3.5-5.0SO2-4, % ≤N,% ≤0.01As,% ≤0.0002Cr6+,% ≤0.0005Hg,% ≤0.00001Pb,% ≤0.001Cd, % ≤0.0002ApplicationFeed water in the ... cityWater reuseRecirculation cooling waterOilfield refill water processingIndustrial water processingIndustrial wastewater processing ...