If you don't, your hands will suffice. You just need to dig a big enough hole in relation to the size of plastic and the container being used. A hole 4 feet wide and 3 feet deep is great for a 6 by 6 sheet of plastic, but if you have smaller materials, a 3 feet wide by 2 feet deep should work just as well, but if you get any smaller, you may not have much luck. Look for soft soil or sand to dig in. A depression in the land is a great spot, or anywhere rainwater might collect that way you have some backup sources— not just pee.
A place where the sun hits is also needed, hence the "solar" in solar still. Here's the best part. If you aren't really interested in drinking your own piss, you can always skip this step and hope to collect enough from rainwater or dampness of the land, but if you're in a hurry, adding a little of your own touch will do the trick.
Just pee in and around the hole. Simply place your container at the bottom of the hole, in the center. Make sure it is secure. If you want, prior to pissing in the hole, you can dig another small hole inside that hole to keep your drippings container nice and snug. If you're using the tubing, run the tubing from the outside of the pit to the bottom of the container.
This allows you to drink straight from the container, without having to disassemble the actual still. A good idea if you plan on being in one place for awhile. Now, stretch out your plastic to cover the entire hole. You're going to need to evenly secure the edges of the plastic, to secure it in place and to keep any air from escaping. You can use the soil that you dug up to lay on the edges of the plastic.
You can also you some rocks for extra weight. Make sure the plastic is not drooping down into the pit. Find the best sized rock for centering on the spread out sheet of plastic. You may have to try a few out to find the perfect stone. Place it directly over the water container below. This keeps the plastic form moving about more than you want, and it pushes the plastic down into a cone shape. A 45 degree angle is best, and the rock works better if right above the container opening.
The cone will point right into the cup, and all the moisture will drip down along the sides of the plastic and right in. Double check that the edges of your plastic our secured and airflow-free.
So astronauts on the International Space Station are testing a new way to drink filtered pee. The filter works essentially the same way your kidney does.
The system is just two tubes hooked up to an energy source. It pulls a liter of urine from one container through the filter and out into another container in less than a minute. The device is small, light and less likely to clog than the filters currently being used.
It is not completely sterile of microorganisms , as many sources incorrectly state. So what if you filter it? Again, sorry to disappoint, the answer is no.
The dissolved salts, ions and molecules, like urea, that are present in urine are too small for backpacking filters and even purifiers to remove. Other forms of treatment, like UV light or chemical treatments only kill the microbes; they do nothing to rid the water of these other molecular-sized contaminants. The only way to safely drink urine such as in a survival situation, as your only water source is to remove those dissolved contaminants from it, or at least bring them down to a negligible level.
There are only two ways to do this. One is reverse osmosis, which uses extremely high pressure to force water through a membrane that literally passes only water not even salt. The other is through distillation—essentially evaporating out the water molecules and letting them condense again in a different vessel for drinking.
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