The invention of the microscope, the discovery of the relationship between cholera and drinking water, and the introduction of chlorine all moved the world of water filtering forward. These are considered some of the landmark events in the history of water filtering systems. Increased technological abilities allowed for implementation on a grand scale, with municipalities the nation and world over adopting one filtering method or another. A general sense had emerged that clean water was a right, and we had the power to make it happen.
Ironically, that same power was at the root of a slowly declining quality of water, nearly everywhere. Why? Industry, the root of innovations and new successes in water filtering, was simultaneously dumping numerous chemicals and waste into natural water sources. Regulation at the time did not prohibit this.
A major move forward for water filtering systems then was the introduction and passage of the Clean Water Act in 1972. This made it a law that every town have some kind of water filtering system, guaranteeing clean water to all. It also moved industry toward cleaner natural waterways, a long range plan that has paid off by diverting a disastrous course of action.
So today, because of legislation, water filtering systems are not only good ideas, they are required.