character: Ms. Thompson
topic: Chemical Filtration in Water Treatment
grade: 12
subject: Chemistry
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character: Dr. Smith
topic: Advanced Water Treatment Processes
grade: 12
subject: Chemistry
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character: Mr. Johnson
topic: Types of Chemical Reagents in Water Purification
grade: 12
subject: Chemistry
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character: Ms. Lee
topic: Environmental Impact of Water Treatment Chemicals
grade: 12
subject: Chemistry
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