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The thermostat purchased is rated at 91°C, which was later verified to be the temperature
the device begins to open at. In the system, the valve remains shut during periods when
the water has not reached a high enough temperature to be considered safe. However,
once the water reaches 91°C, well above the pasteurization temperature, the valve begins
to allow the flow of water into the clean reservoir. If the system falls below this
temperature, the valve closes again, and the water will not pass until the system heats back
up. With the thermostatic valve and the geometry of the trough, this device can be
completely passive, and purify water throughout the day without human intervention.

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Figure 2: Schematic of Modified Thermostat. The blue blocks represent the silicone "gasket" addition to the
thermostat.

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