"BOPU" brand GCS (Granular Calcium sulfite ) can be used for rapid removal of free residual chlorine in water, including ClO-(hypochlorite ions), HOCl (hypochlorite), Cl2 (chlorine). "BOPU" brand GCS (Granular Calcium sulfite ) is a white granular and efficient removal of residual chlorine in water treatment system, it is made by calcium sulfite and food-grade binder through advanced technology production process, so the finish products are firmly bonded, no powder leaching out. Through strictly production process, we can ensure the content of ingredient calcium sulfite more than 78%. The GCS are high efficiency, good stability, security and application of a wide range of advantages and can be widely used in POU and POE area.