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A still - that's the word I was looking for earlier. I wonder if the medicinal residue would be left as a goopy solid at the bottom while the "pure" water evaporated off the top. I can't imagine this process being feasible or energy efficient on any massive scale though.

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RE: Filters?
Desalination? I don't know for sure; I do have some friends I can ask--I used to be employed by a major water utility. My gut says it would be ok.. but this doesn't do anything to help the freshwater environment.
BUT..the small ppm, while not affecting human population, has huge effects on animal life. Try this one as well.
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