There you go... dragging reality into a perfectly good discussion. <img src="/images/graemlins/wink.gif" alt="" />

I hadn't considered the clean up problem. Some solar still designs I've seen recommend flushing "the system" with the dirty water every so often to prevent sludge build up. If you did this with the tent, you'd flush out any leftovers, but you would have also washed your tent out with water too dirty to drink. Yuck.

The idea seems to have so much going for it... by using a still the size of a tent, you can get a lot more water per day. But, by using a still the size of a tent, you're carrying around two tents. <img src="/images/graemlins/frown.gif" alt="" />