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Project-Based Learning: Water Purification
Information about various types of Problem-Based Learning and Project-Based Learning
"Since 2010, water utilities' testing has found pollutants in Americans' tap water, according to an EWG drinking water quality analysis of 30 million state water records." Contains searchable database by zip code.
"Solar disinfection (SODIS) was developed in the 1980s to inexpensively disinfect water". From the U.S. government Centers for Disease Control and Prevention.
Caught Prepared: 25 Simple Steps to Protect Your Family in an Emergency by 
Clean Water : an introduction to water quality and pollution control by 
Water: a comprehensive guide for brewers by