% Sodium Bisulfate(SBS, NaHSO4): 91.5% – 95.2% % Sodium Sulfate(Na2SO4): 4.2 – 8.4% % on drying: 0.1% – 0.64% Bulk Density: 1.32 – 1.35 g/cc Color: White Chlorides (ppm): 150 – 250 Iron, (mg/kg): <10 Origin: USA