Treated water may be disinfected before release with chlorine and:
ARadon
BOzone
CArgon
DXenon
Answer & Solution
Correct answer: B. Ozone
1. Disinfection kills remaining microbes.
2. Chlorine and ozone are used.
3. Then water enters the distribution system.
_Source: syllabus Science, Chapter 18, Wastewater Story._
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