[ibisum]

>a narrow necked container?

You mean, like .. a pencil you can turn upside down, attach a lens to, and it'll make a steamy cup of tea for you?

Sign me up!

I bet they can solve the salt problem with some kind of pulp-based filter wrapping around the graphite-corn solar layer which, when it too dries out, allows salt crystals to fall .. or at least, there's gotta be a third cheap material to add to the mix which would assist salt extraction by osmosis, or whatever ..

[abakker]

It seems like you could easily solve the salt problem every time it clogs up just by putting a lid on the jar, shaking it up a bunch to re-dissolve the salts in liquid and then add new liquid into keep the overall salinity down. Assuming these pores don't clog very quickly, it seems that "rinsing" the graphite could work.