We use them too Ron! They are great! Cheap too
From their website, I liked this:
Uses
Chlorine is used in thousands of commercial compounds used directly or indirectly in applications, 98% of the U.S. drinking water systems, 85% of pharmaceuticals and 96% of crop- protection chemicals. They are also widely used in plastics, disinfectants, paper manufacturing, bleach, wastewater treatment, food processing and many other industrial processes and chemicals.