Only one percent of all the water on our planet is fresh and in some places limited supplies of fresh water are augmented by adding treated wastewater to drinking water. This treated water is probably cleaner than what comes out of some faucets.

Rolling Change Across Continents: How the Hippo Roller Is Transforming Lives Through Improved Water Access
Access to water is about far more than quenching thirst. It is about health, dignity, education, food security, economic opportunity, and hope. Across Africa and
