The ARF Chlorine Granules 5kg are manufactured with a stabiliser to help prevent the breakdown of chlorine by UV & sun rays, as this can reduce the effectiveness of adding the chlorine to your water. Perfect for Pools, Spas & Hot Tubs, the ARF Chlorine Granules 5kg help maintain the cleanliness & hygiene of your water by destroying non-filterable waste & bacteria that can build up over time. Thanks to their increased stability, the ARF Chlorine Granules 5kg have an advantage over non-stabilised chlorine as their effects last longer which helps you use less of the product – saving you money over time!