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[bobf <bobford79 AT yahoo.com>]

Another water purifier system I have never seen.  Might be of use to some 
one.  If you click on the link there is photos and another link to a 
"Treehugger" article on the same thing

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Solvatten Solar Jerrycan Purifies Water Using Nothing But Sunshine

By Elaine Chow, 12:30 AM on Tue Jan 13 2009, 10,093 views 

Providing clean water is an integral part to any effort to raise third-world 
living standards. Solvatten, a Swedish-designed water purifier, does its job 
using nothing but a couple of hours in the sun.

The Solvatten looks like a standard jerrycan sliced in half and divided into 
two 5 liter compartments, each of which has a clear face. The two chambers 
are exposed to sunlight, which naturally heats the water to a 
pathogen-killing temperature of roughly 130° F. An indicator changes from red 
to green when the water is safe to drink.

The whole process takes about 3 to 4 hours when its sunny, and 5 to 6 when 
it's cloudy. While that's not perhaps the fastest way to cure water, the 
amount of resources it saves compared to boiling over gas stoves makes it 
ideal for making sure some clean H2O will be on hand later. [Treehugger]

Solvatten Solar Jerrycan Purifies Water Using Nothing But Sunshine
By Elaine Chow, 12:30 AM on Tue Jan 13 2009, 10,093 views 
Providing clean water is an integral part to any effort to raise third-world 
living standards. Solvatten, a Swedish-designed water purifier, does its job 
using nothing but a couple of hours in the sun.

The Solvatten looks like a standard jerrycan sliced in half and divided into 
two 5 liter compartments, each of which has a clear face. The two chambers 
are exposed to sunlight, which naturally heats the water to a 
pathogen-killing temperature of roughly 130° F. An indicator changes from red 
to green when the water is safe to drink.

The whole process takes about 3 to 4 hours when its sunny, and 5 to 6 when 
it's cloudy. While that's not perhaps the fastest way to cure water, the 
amount of resources it saves compared to boiling over gas stoves makes it 
ideal for making sure some clean H2O will be on hand later. [Treehugger]

http://i.gizmodo.com/5129971/solvatten-solar-jerrycan-purifies-water-using-nothing-but-sunshine