Eli5: Why do we use clean, potable water in toilets?
In: 228
We don’t have to. Historically it’s been cheaper and more conveniënt, but with water becoming a more valuable resource many places around the world are using treated waste water or just locally stored rainwater.
Engineering explained has got an excellent video on the matter: [https://youtu.be/sUoO_U_GWFo?t=594](https://youtu.be/sUoO_U_GWFo?t=594)
Here in Belgium new constructions REQUIRE a rain collection system that is used for toilets and laundry. When doing renovations, the state subsidizes these systems in an effort to mitigate climate change and lowering levels of ground water. I believe it’s similar in other EU-countries.
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