Sodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPOSodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPO3)6.Sodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPO3)6.Sodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPO3)6.Sodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPO3)6.Sodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPO3)6.Sodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPO3)6.Sodium Hexametaphosphate is also called as Calgon. The formula for Sodium Hexametaphosphate is (NaPO3)6.3)6.