Is It Clean or Just Unseen? Dirty Water and the Naked Eye

How dirty is the water you consume? Pupils investigate a contaminated water source to determine the bacterial cell count. They participate in a discussion once results are obtained and relate this to drinking water and health safety.

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Instructional Ideas
  • Show video segments of contaminated water and the effects of drinking it
Classroom Considerations
  • Participants should have prior knowledge of how to use transfer pipettes and a compound light microscope
  • Do not allow individuals to consume dirty water as it may result in illness
  • Hands-on experiment allows the class to visualize the content of dirty water and relate this to the importance of clean water
  • Experiment may be divided into two parts or held during an extended class session
  • None