The book, The Chlorine Revolution: The History of Water Disinfection and the Flight to Save Lives, is a must read. The book details the Revolution that is the use of Chlorine in our drinking water. For as long as we can all remember, we can all turn on the tap and drink directly the water that flow out without worry of diseases, without worry of drinking contaminated water.
Dr. John L. Leal, physician and water expert, was responsible for the implementation of Chlorine. The story background happened in Jersey City, New Jersey, in 1908. With multiple trials, finally Chlorine was approved and widely used throughout the US.
With all that Dr. Leal did for the drinking water, he is often ignored. It was not until May of this year that members of the New Jersey Section of the American Water Works Association and members of the community honored Dr. Leal with a ”Hero of Public Health”. And during August of this year, that the American Water Works Association established a major annual award.
I would recommend the book or at least to look up the bio of Dr. Leal.