Toilet to tap has been going on long before the toilet was invented. Consider every organism (animal) in the oceans, lakes and rivers lives in their own waste water that has recycled through effective symbiotic relationships. One organism’s waste is another organism’s food.
However, surface water is generally reclaimed/purified through evaporation. Over millions of years, simple to complex organisms have produced waste water that has been recycled. I expect virtually every molecule of surface water has been recycled waste water at some point in Earth’s history.
So, toilet to tap? 100% natural before humans figured out ways to expedite the purification process. Of course, whenever humans are in the mix, things may or may not go sideways.
James Abels
Midtown
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