White granular crystal high quality sodium bisulfate it is usually added to large piping systems to prevent oxidative corrosion. In biochemical engineering applications, it is helpful to maintain anaerobic conditions within a reactor. Sodium bisulfite should not be confused with sodium bisulfate which is used as a ph lowering chemical for swimming pools.in drinking water treatment, sodium bisulfite is often added after super chlorination, to reduce the residual chlorine before discharging to the service reservoir.in wastewater treatment, sodium bisulfite is often added following disinfection with chlorine prior to discharging the effluent to the receiving water. Residual chlorine can have a negative impact on aquatic life. Cas:7681-38-1 othername: sodium hydrogensulfate molecularformula: nahso4 m.w.: 120 property: white granular crystal, its anhydride has hygroscopicity. Its solutionappears acid reaction and the ph of 1mol/l solution is about 1.4 use:as ph adjusting agent.it canmake ceramic.it also can be used as auxiliary agent for dyeing, solvent formelting mineral, disinfectant and detergent for in daily chemical industry, rawmaterial for sulfate salts and sodium alum, and also used as petroleum artesianwell and ameliorant.