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Moisture 0.27% Purity (NaCl on dry basis) 99.37% Water Insoluble Matter 0.066% Ca++ 0.10% Mg++ 0.05% SO4â??0.31% CaSO4 0.32% MgSO4 0.11% MgCL2 0.12% HCO3- 0.018% CO3-- Absent CaCO3 Absent Ca(HCO3)2 0.02% PH 6