Sewage. Let’s start with all the crud and muck we throw into the water pipes, after we wash dishes, clothes, ourselves and even after we have sex. See upper left. This water in Mexico City ends up in one of many treatment plants later, cleansed, filter, eaten by bacterial microorganisms and then used for irrigation, canal filling and industry, including shopping centers.
©2013 Carlos Cazalis/All Rights Reserved. Mexico CIty, Mexico.