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Gaining access to potable water has been a challenge in developing countries for centuries. According to the Global Risks 2015 report by the World Economic Forum, global water crises are the biggest threat facing the planet over the next decade. Globally, 785 million people still lack even basic drinking water services, and at least 2 billion people are using drinking water sources that have been contaminated with feces. As a result, 485,000 people die each year from diarrheal diseases related to contaminated drinking water. Cities in particular have found it difficult to provide drinking water and sewage systems for their residents, as urban populations skyrocket and groundwater runs dry.