TED-Ed
When Is Water Safe to Drink?
How safe is the drinking water you have access to? Colors, smells, and other factors may lead you to finding out if your water is safe. Watch a video that explains the ways water becomes filtered and ways to know when water is contaminated.
Fuse School
How Sewage Treatment Works - Water Treatment
To flush or not to flush ... that is the question. Is the wastewater treatment program in most towns and cities really the most efficient way to deal with waste? The fourth installment in a series of seven videos about the world's water...