character: Dr. Lisa Green
topic: Introduction to Water Treatment Processes
grade: 9
subject: Chemistry
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character: Dr. Mark Johnson
topic: Fundamentals of Water Quality
grade: 9
subject: Chemistry
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character: Ms. Sarah White
topic: Chemical Reactions in Water Purification
grade: 9
subject: Chemistry
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character: Mr. Tom Brown
topic: Environmental Impact of Water Treatment
grade: 9
subject: Chemistry
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