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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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