system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do our bodies waste so much good water when we pee?

Surely just pooping out a big blob of urea and saving the water would be better.
gpt
- It would be quite troublesome to regulate the opposite: Excess water --> Diarrhea every time.

- The kidneys are much more efficient at filtering out electrolytes and water soluble molecules. It would also create a troublesome system of the bowels both needing to absorb as many electrolytes as possible, while wasting the same amount away.

- Our blood needs to be continually cleared, while the bowels do not permit storage of fluid for very long :-l.