UV purification

I have been thinking about the UV purification that Risto mentioned at the critique. I did some quick research on it, and apparently solar radiation was three effects that are believed to contribute to the disinfection of water:

• UV-A interferes directly with the metabolism and destroys cell structures of bacteria.
• UV-A (wavelength 320-400 nm) reacts with oxygen dissolved in the water and produces highly reactive forms of oxygen (oxygen free radicals and hydrogen peroxides), that are believed to also damage pathogens.
• Infrared radiation heats the water. If the water temperatures rises above 50°C, the disinfection process is three times faster.

Basically, on a sunny day you should get clean drinking water just by placing a plastic bottle in sunlight for six hours. I wonder how fast this would be with concentrated sunlight.

Of course if we wanted to use this method with our concentrator the water might have to be at least filtered somehow, because it probably has to be clear. And we need to remember that this method only kills the pathogenic organisms but doesn't purify the water in any other way. So if the water contains for example chemicals or other materials, such as arsenic (which is a common problem globally), it would need other treatment as well.

So, would this be something we'll consider, or do we stick to the original plan (distilling water), at least for now?