Sodium sulfate anhydrous is an electrolyte replenisher and is used in isosmotic solutions so that administration does not disturb normal electrolyte balance and does not lead to absorption or excretion of water and ions.SODIUM SULTE (as Na2SO4) 99.5 MinMatter Insoluble in Water 0.01 MaxChlorides (as NaCl) 0.02 MaxIron as Fe 0.001 MaxLoss of Drying 0.50 Max(of 10% Solution) 7.5 - 9.5Iron, Aluminium & Chromium (as R203) 0.02 MaxMoisture (%) 0.02 Max