On one of my trips to Australia I got off the plane and stopped off at the bathroom and was surprised to find signs up over the urinals saying not to drink the water. I found my friend at departures and on the drive back to his place I mentioned it - he got all excited to explain it was because Sydney airport had recently changed over to greywater as a conservation effort. Before he got too deep into explaining how it worked I had to cut him off and say “I get that it’s a great idea, but my question was more about why do Australians need signs above urinals to inform them it’s unsafe to drink from”
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