character: Ms. Lee
topic: Water Purification Techniques and Their Efficacy
grade: 11
subject: Chemistry
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character: Dr. Smith
topic: Chemical Filtration Methods and Their Impact
grade: 11
subject: Chemistry
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character: Mr. Johnson
topic: Biological Water Treatment Processes
grade: 11
subject: Chemistry
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character: Ms. Patel
topic: Comparison of Natural vs. Chemical Purification
grade: 11
subject: Chemistry
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