Certikin 56% granular chlorine of 50 kg is a rapidly soluble stabilized chlorine to be used for swimming pool water disinfection, composed of 56% chloroisocyanurate. Highly stable product for photolysis and evaporation. Develops a solution of acid chlorine with consequent reduction in the consumption of the acid corrector. Chlorine, in addition to disinfection, also performs an oxidizing function, thus eliminating non-filterable organic substances. The product is Italian, guaranteed by the Ministry of Health.