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[bobf <bobford79 AT yahoo.com>]

I have seen plans for solar stills to distill surface water.  I have not 
before seen this simple method. It is being used in third world countries to 
provide people with safe drinking water. Maybe in an em,ergency it might help 
someone on a homestead or farm for  a short period of time if their pump went 
down .................

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Solar Water Disinfection - The method
 
The Solar Water Disinfection (SODIS) process is a simple technology used to 
improve the microbiological quality of drinking water. SODIS uses solar 
radiation to destroy pathogenic microorganisms which cause water borne 
diseases.

SODIS is ideal to treat small quantities of water. Contaminated water is 
filled into transparent plastic bottles and exposed to full sunlight for six 
hours.

Sunlight is treating the contaminated water through two synergetic 
mechanisms: Radiation in the spectrum of UV-A (wavelength 320-400nm) and 
increased water temperature. If the water temperatures raises above 50°C, the 
disinfection process is three times faster.
 
 
http://www.sodis.ch/Text2002/T-TheMethod.htm


http://www.sodis.ch/Text2002/T-TheMethod.htm