It would, but it would most likely be less efficient than filtering the water you're floating in :)

A good way to increase the efficiency of this machine would be to increase the relative humidity by adding moisture. This is the reasoning behind our next planned experiments of reclaiming water from urine!

You might be able to get away with using the reverse osmosis system we have, [0] but send the water to a lab to test influent (intake) and effluent (output) before consuming :D

[0]: http://123filter.com/catalog/ispring-7-stage-75-gpd-reverse-...