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Specifications Assay (NaHSO2 . CH2O . 2H2O) 98 % MIN Sodium Formaldehyde Bisluphite (NaHSO2 . CH2O . H2O) 4% Max Sodium Sulphite (Na2SO3) 3% MAX PH of 10% solution 7.5 - 10.0 Alkalinity 1.5% as - Na2CO3