What’s in the water?

Back in the 1850s, Dr John Snow discovered that just because the water from a particular pump appeared clear, that was no guarantee that the water was clean.

In this experiment, we show you how to use some simple scientific techniques to discover how something that appears invisible can be revealed in front of your eyes.


For this experiment you will need:

  • 2 Glass tumblers (clean)
  • Scissors
  • Teaspoon
  • 2 Paper coffee filters
  • Plastic bottle or funnel
  • Jug
  • Sugar
  • Plain flower


Water filtration experiment