character: Mr. Johnson
topic: Types of Chemical Reagents in Water Purification
grade: 12
subject: Chemistry
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character: Dr. Smith
topic: Role of Chlorine and Chloramine in Disinfection
grade: 12
subject: Chemistry
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character: Ms. Patel
topic: Activated Carbon Filters and Their Effectiveness
grade: 12
subject: Chemistry
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character: Professor Lee
topic: Ozone as an Advanced Oxidation Process in Water Treatment
grade: 12
subject: Chemistry
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