Gray Water
I ran into a plumber just now, who, when the subject of environmental sustainability came up, explained that his pet peeve is our society’s lack of concern about the use of potable water for applications in which “gray water” would do just fine. Examples include flushing toilets and lawn irrigation.
Well — what do you expect?
“Water” is what he works with / in every working day.
And I’ll bet that if you checked – instead of pointing fun at what he said to you here — he probably is correct.