Treating water is used to remove harmful substances before drinking.
Ordinary tap water can be full of harmful substances like chlorine, pesticides and heavy metals.
Treating water is used to remove chlorine, pesticides, and heavy metals before drinking.
What does treating water remove before drinking it?
Options:
  direct damage to the lungs
  h2o
  an area swollen with pus
  chlorine, pesticides, heavy metals
  molecules
  vapor
  Mutagenic chemicals
  nonliving organic matter