Interesting device. I wonder how much suction is really required though. I can just imagine being worn out/tired/exhaused, then trying to suck the equivalent of a milkshake through a coffee stirrer.

And the lack of filtration to viruses could be problematic. Ie, polio, hep A, JC and BK viruses... though all relatively rare. Though typically the bacterial and protozoan stuff is more worrisome.