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People collect drinking water from a tanker in Sanjay camp, Chanakyapuri, on July 10, 2021, in New Delhi, India. Call for Code winner Saaf Water created a solution to help identify unsafe drinking water. (Sonu Mehta/Hindustan Times via Getty Images) At a Glance The team created a device to monitor water quality in rural areas.They will receive $200,000.Four other finalists were awarded cash prizes. An innovative water-quality monitoring device called Saaf Water is winner of the 2021 Call for Code...