ITEMSTANDARDContent (KHSO4)99.0%-101.0%Clarity TestQualifiedWater Insoluble≤0.002%Cloride (Cl)≤0.0005%Nitrogen Compound (N)≤0.002%Phosphate (PO4)≤0.001%Silicate (SiO3)≤0.001%Na≤0.02%Mg≤0.0005%Al≤0.001%Ca≤0.0002%Fe≤0.0005%As≤0.0003%Pb≤0.0005%