The "water treatment" industry (aka fear-mongering/selling products) in context is part of the larger movement towards the Nanny Nation we now sadly are becoming.

I'm not saying never treat water (in some cases you MUST treat water), but the whole subject is so overblown as to be preposterous, let alone "double treating" water. Good grief.

Some good reading here...

http://www.lightandmatter.com/article/hiking_water.html