They were studying the way exposure to chlorine vapor can cause Asthma. It was believed that out door pools allowed Chlorine to evaporate more quickly. This was more an assumption than a fact. Chlorine Gas and HCl or Hydrogen Chloride, which becomes Hydrochloric Acid, when it dissolves in water as a matter of course, is best in the stomach for digestion, or with or with the Alkali NaOH (Sodium hydroxide) which becomes the neutral Salt
It Does Not Belong in the Lungs.
Why do we use chemical Pan Microbicides, when there is the potential to give water its own version of an immune system?
Creeks, rivers and Oceans Don't need Chlorine to remain clean. Why should we think we have a better defense using Chlorine.
killing all microbes can turn water Sterile and Stagnant. We need Oxygenated Water,(Waterfall) and microbes can be part of a self contained Eco=system
Pools don't need Chlorine, they need things like Fish . this will also help recycle biological 'waste' we produce naturally