Safe to Drink

Dec-26-10 University of Washington students have designed a way to determine when water being purified in plastic bottles is safe to drink.

SODIS (Solar Disinfection of water in plastic bottles) is a water purifying solution that uses the sun's heat and ultraviolet rays. Until recently, though, there was no easy way to know when the water was properly purified. The four engineering students from UW have developed a simple and inexpensive device that monitors how much light is passing through the bottle, and indicates when the water is safe to drink.

Designed using a parts from a keychain that blinks when exposed to light, the device has a indicator light that blinks on and off as long as particulates are obstructing light flow through the bottle. The estimated cost in parts for each device is about $3.40.

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