Eli5: Why do we use clean, potable water in toilets?
In: 228
The other answers are all generally correct, but it is worth mentioning that there are some places where there is a separate non-potable water system that uses treated wastewater for things like toilets, irrigation, etc. So it’s not so much that it is a bad idea, just an expensive one — particularly in places where the infrastructure isn’t being newly laid down.
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