The first rule of civilization to me is: GOOD WATER IN-BAD WATER OUT. Herein lies the purpose of the human drain.
After my mastectomy and expanders, I came home with six drains. They took the excess liquid my body wasn't able to absorb, and helped me eliminate it. Each drain was cleaned out and measured several times daily.
It was a strange thing concealing the drains when going out into public. I put them in a fanny pack, stuck them in pockets or safety-pinned them to my pants.
Giving new meaning to the term "Getting A SixPack, the drains would be removed as they produced less and less fluid. Getting my drains out over time (2 to 3 weeks post surgery) was a most joyous occasion.