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Solar still do NOT make urine completely safe to drink. Solar stills only remove impurities such as salts, heavy metals and other dissolved solids, and does eliminates microbiological organisms. However any chemicals (with boiling points anywhere near water) in the source sample, will still evaporate and condense with the water. In a solar still you can't control the evaporation point, so all of those chemicals and toxins your body flushes will still transfer. It will be safer to drink than pure urine or other source water to be treated, but a solar still can NOT produce pure water. Only separate those heavier contaminants with much higher boiling points and any organic materal and other dissolved and undissolved solidsDistillation in the laboratory or controled setting can achieve extraction of pure water by using exact temperatures. Different chemicals have different boiling points and if you can focus on water's boiling point, it will evaporate leaving behind any chemicals that have a higher boiling point.
IKEA Hacks - Volume 2
Drink Your Own Pee - [survival guide]
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