Test and Treat Before You Drink - Lesson
A diagram shows the six steps of a typical drinking water-treatment plant: 1) first filtration (screens remove fish, leaves and trash), 2) coagulation (alum is added to form sticky flocs, 3) second filtration (water trickles down through sand or gravel, which filters out algae, bacteria and some chemicals), 4) chlorination (chlorine added to kill remaining organisms), 5) aeration (air forced through water to release gases, reducing unpleasant odors and taste), and 6) additional treatment (...
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