CW Pool Dichlor Granules (sodium dicloroisocyanurate) are 100% soluble, fast dissolving, stabilised granule for use in swimming or spa pools. These are normally dispensed through a floating dispenser. Dichlor is used as a disinfectant, sanitiser, biocide, fungicide and algaecide for pools. Best for spa and pool water with a pH of 6.7 - 6.9 being neutral.