Edit: OK, I am not sure where I got 2.5 gallons from because it turns out standard toilets in the US are 1.6 gallons, as the comment below states. It still seems crazy to me that 1.6 gallons can push waste all the way from the toilet to the sewer. I feel like it would stop at some point and need more water to get to the street.
On a side note, I find plumbing and water treatment fascinating.
In: Engineering
The water acts more like a lube and volume enhancer for the turds, Gravity and pumps pull and push the turds all the way to the treatment house.
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