posted on Mar, 7 2014 @ 02:02 AM
What would be better to filter? Some somewhat clean looking water you collected and boiled first?
Filtering your pee with this will give you very clean pee to drink.
You can do that with a RO filter if you've got a lot of pee and you don't mind possibly clogging your membrane up early.
There are a lot of nifty filters out there, I'm always surprised that it's so hard to take a good filtering technology and develop it. This one
seems interesting for getting bacteria and parasites out although it will leave in viruses and chemicals.
Long ago, we did a filter that rocked in conjunction with a very well-known appliance company. It was a bit frustrating. They had a lot of bucks, and
plopped them out as we developed a very nice filtering element with a third tier that did that sort of thing. Basically, it started out as a very
large bundle of plastic tubes like soda straws (but smaller...). You heated the thing and drew it mechanically, and the tubes reduced in thickness and
diameter until the result was a seemingly solid white cylinder that had pores smaller than a virus where the lumens of the tubes had been, about an
inch across. It had an amazingly low filtration pressure, since there were so many pores and they were really smooth inside the bores. Water pushed
through this thing would pass but anything as large as a virus would not go through. On the intake side we had a debris filter to keep the chunky
stuff out of the primary filter so it didn't clog, and on the outlet side we had a mixed anion-cation ion-exchange resin bed you could swap out
easily that took out metals, combined with an activated carbon bed for organics.
In the field, you got a pretty long life with the primary filter, the gook filter could be rinsed and reused several times, and you chucked the back
end filter as needed, there were little indicators that changed color as the resin was used up.
We used to drink ditch water with the thing. There wasn't a lot that could get past it. Our idea was to market it for military use, but they didn't
want to do that, they didn't see camping as a large enough market, didn't want to put it on airlines (you really ought not drink anything not
bottled on a plane...) or sell it in Europe in those countries where the tap water isn't potable, so they killed the project off and left the filter
element company people swinging for the development costs. At one time you could still buy the main filter element off-the-shelf from the place,
haven't been back for years to see if they still have it.