Starting on page 274 in Jim's latest book:
"MMS2—Details
MMS2, calcium hypochlorite, is sometimes known as Pool Shock. It is sold in pool stores and grocery stores throughout the world. As long as it is for swimming pools, manufacturers cannot put bad things in the pools that would hurt swimmers, and thus cannot put harmful things in the calcium hypochlorite. The package will say it contains somewhere from 45% to 85% available chlorine.
This is not true. As long as you have calcium hypochlorite (not sodium hypochlorite, which does produce chlorine) there is no available chlorine. When calcium hypochlorite is dissolved in water it turns into hypochlorous acid (HOCl) and there is no chlorine available. HOCl is the same acid that your body naturally generates to kill disease and destroy poisons. When you take MMS2, you are giving your body more of its own ammunition against disease. The microorganisms in a swimming pool are killed by the calcium hypochlorite which is turned into HOCl.
Manufacturers only say there is “available chlorine” in order to make the calcium hypochlorite sell, as many in the world unfortunately still think that chlorine is a safe and effective product for killing microorganisms—and it is a common mistake to mix up these terms. Chlorine, which is sodium hypochlorite, will kill microorganisms, but it also is harmful to the human body. Calcium hypochlorite, which when added to water produces hypochlorous acid, will also kill microorganisms, but it is not harmful to the human body and does not contain the chemical “chlorine”.