How the water you flush becomes the water you drink

Explore the science of wastewater treatment, and find
out why water reuse has become increasingly
common worldwide.
In 2003, Singapore's national water agency launched
an unprecedented program to provide more than 50%
of their nation's water supply by recycling wastewater.
The program had been planned for decades to ensure
the island nation never ran out of clean water. But is it
really safe to reuse anything we flush down the toilet?
Francis de los Reyes explains the science of
wastewater treatment.