One sodium hypochlorite molecule (molecular weight of 74.44) reacts with one molecule of sodium metabisulfite (molecular weight of 190.1), you'll need two and a half grams of metabisulfite for every gram of hypochlorite not knowing what surface or material you are trying to apply this to (IF any) cannot give directions on use It is important to note that the fumes produced by sodium metabisulfite include sulfur dioxide, a very irritating gas that can cause dangerous reactions, especially in people who have asthma. Wear breathing protection (A cartridge respirator fitted with an acid gas cartridge works).
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