Life long city dwellers. To them, water is piped into their homes clean and pure (OK, it's cloudy, smells a bit off and has been intentionally contaminated with chlorine and fluorine, but to them it's pure.) used once and returns even more contaminated than it came. They neither see nor understand that there is a natural recycling of water going on all the time, forever.
I never realized just how much chlorine was there until I moved to my new house a little over a year ago.
Now I can smell it when I use water from a municipal source.