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I wish people would stop acting like there is one end all be all treatment method for all areas. In the high country, snow melt of a high deposit, probably not contaminated. River water in the Rockies, probably has heavy metals from mining and I for one will filter and treat it. Water from a high stream, chemical treatment should be fine. River water from the Rio Grande, flocculation with alum, filter, and chemical treat. There are countless scenarios and part of being an adept /out/doorsman is knowing when to do what.