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Water can be pasteurized in black pots or jars in solar cookers using a batch process where once the water has reached pasteurization temperature, the jars and pots are removed from the cooker and allowed to cool before drinking. A flow-through pasteurization device, however, can pasteurize more water in a given time period for the following reasons:
- The hot pasteurized water exits the cooker into a simple heat exchanger where much of its heat is transfered to the cold water that is entering the cooker.
- The thermostatic valve opens precisely when pasteurization temperature has been reached (with some safety margin). This means that the water is never heated to a higher temperature than is necessary to make it safe to drink.
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