Eli5: Why do we use clean, potable water in toilets?
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The short answer is that Americans are lazy and our infrastructure was made with potable toilet water in mind. Other countries (and even the U.S. military in some situations) use a three-tier water system. This is especially true in deserts. It does require additional planning during construction or renovation and the storage tanks for grey water, but it is both doable and a good idea. There are even systems that cycle grey water through interior pipe systems to provide insulation in homes, but, again, it’s harder to pull off. But it saves Oh-So-Much on both water and electrical bills…
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