So I was watchin CNN online, and came across this video of a family in Kenya who store unclean water in bottle and set them on the roof. After 6 to 10 hours the water is pure of microorganisms like E.COLI. The video does a culture test of 3 samples; one from the bottles, one from a storage tank, and one from a stream. The bottle had no to little bacteria, the storage had ample amounts to cause abdominal sickness, and the stream would have caused severe illness.
Not bad for the sun eh?
LINK
I also found some links concerning solar water purification
low solar tech
and heres where good design comes in
Inhabitat- Solar Bottle
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