Desalination requires around two gallons of sea water to make one gallon of fresh water—that's quite a ratio! Viewers consider the pros and cons of desalination as one option to providing fresh water. They learn about two different desalination methods in the sixth lesson of a 10-part unit on Fresh Solutions.

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CCSS: Adaptable
NGSS: Designed
Instructional Ideas

  • Research the ways boats that stay at sea for long periods of time get fresh water
  • Ask class members to investigate the water conservation and recycling issues on the space station
Classroom Considerations

  • Relies on knowledge of the scarcity of fresh water

  • Includes closed captioning for easier note taking
  • Offers a forward-looking viewpoint to inspire scientists of the future

  • None