Have found the other salt water generator on eBay :

http://goo.gl/6UrItI

The specs sheet looks similar to the Russian model (120 hours on one cathode), but like 10 times more expensive.

And another one (smaller and cheaper): http://goo.gl/Dwe376 No specs, but there is a same "120" number on the image of the box.

Sure thing it's just a weird option. And not a very sustainable one (if you run out of the supply rods...). I believe modern solar panels are the way to go, just don't rely too much on small ones, get a 150W one, it works in overcast. For portability I'd go for film panels.