... GR SpecificationItemQualificationItemQualificationPurity ,%≥99.8Potassium (K),%≤0.001pH(50g/L,25°C)6.0~7.0Calcium (Ca),%≤0.001Clarity ... :500gAR SpecificationItemQualificationItemQualificationPurity ,%≥99.5Potassium (K),%≤0.002pH(50g/L,25°C)6.0~7.0Calcium (Ca),%≤0.002Clarity ... 002Chloride (Cl),%≤0.001Iron(Fe),%≤0.0005Sulfate (SO4),%≤0.01 Heavy metal (as Pb), %≤0.001Package:25kg 500g Ammonium formate ...