It is used in the manufacture of bleaching powder, hard water softener and tap water disinfection and clarification agent and in the construction industry. It is used in pharmaceuticals. It can be used as an additive in rubber and petroleum industries, and can be used in lubricating oil to prevent coking, sludge deposition, neutralization and anti-corrosion. It can also be used as a hard Chemicalbook water softener, disinfectant, antacid, etc. Used as analytical reagent, carbon dioxide absorber, also used in organic synthesis Used to make bleaching powder, hard water softener, depilatory, disinfectant, antiacid, astringent and various calcium salts