Filtration Lesson

This activity demonstrates for children how dirty water becomes clean through different types of filtration and highlights the basic concept of sanitation.
Filtration Lesson

We call this filtration. Press the WATER button and follow the water as it changes from yucky to clean.

Materials you’ll need

  • Mason Jar
  • Sand
  • Coffee Filter
  • Kitchen Strainer
  • Measuring Cup
  • Water


  1. Hold the strainer over the mason jar and pour water to fill half full, then follow with sand. Note how the sand goes right through the strainer and into the jar, “contaminating” the clear water.
  2. Clean out the mason jar.
  3. Insert a coffee filter into the open top of the clean mason jar. Pour sand into the filter, then pour the water through the coffee filter until the jar is half full. Note how the sand doesn’t get further than the filter, so the water stays clean.

Suggested discussion topics

  • How the water we drink out of our faucets is filtered before it gets to us.
  • Why keeping dirt and other items out of our water is so important to stay healthy.
  • How some communities don’t have clean water to drink so they need our help to build wells and systems that use filtration.

Free audio visual download with each book purchase

For Julian’s Birthday and Earth Month, enjoy free audio visual books narrated by Julian Lennon when you purchase any book in the series.

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