Heating water to a sufficiently high temperature for a certain period destroys harmful microorganisms; this process is often termed “pasteurization” after the scientist Louis Pasteur (1822–1895). Solar pasteurization is a well-known water purification technique in developing countries as it can be performed using only household objects and the heat of the sun. Devices can range from cheap, homemade devices that take multiple hours to pasteurize small amounts of water to expensive, complicated devices that can pasteurize larger amounts of water in shorter amounts of time.
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