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" ... With only a bucket, a spoon, a bit of cloth and a P&G packet, anyone can purify 10 liters (2.6 gallons) of filthy water in 30 minutes (see figure above). It uses a coagulant (iron sulfate) to remove contaminants from water by causing particulates to clump together, or flocculate, where they can be filtered through simple cloth. A disinfectant (calcium hypochlorite) kills bacteria and viruses. ... "