Cleaning Dirty Water

Science A12: Cleaning Dirty Water

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Award-winning video and lesson investigations on the topic of cleaning dirty water.

Product Description

Award-winning video and lesson investigations on the topic of cleaning dirty water. Key concepts include:

  • Cleaning dirty water can be investigated with simple equipment.
  • Some materials clean muddy water better than others.
  • Fine materials let the water pass through more slowly than coarse materials.
  • Various materials can be used to filter out particles present in water.
  • Some of these filtering materials include rocks, charcoal, sand, cotton-wool and cloth.
  • The closer together the filtering material is packed, the finer the particles that can be filtered out of it.
  • Looser materials remove large impurities; finer materials remove tiny impurities. The slower the ‘filtration’ speed, the cleaner the water becomes.
  • Sand does not make the water absolutely clean.

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