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May Science Challenge

December Science Challenge

Get involved in our May Science Challenge - Filtering dirty water.


  • Dirty water (or mud and clean water to mix together)
  • A funnel
  • Kitchen roll/coffee filter papers
  • Sand
  • Stones
  • Any empty bottle/container
  • Measuring jug


  1. Place the kitchen roll/coffee filters in funnels (these can then be put in the top of the empty bottles).
  2. Then, add stones into one funnel, sand into another and then an empty funnel with just kitchen roll.
  3. Pour the same amount of water through each filter and observe what happens.


Is it easier to filter sand or stones? Is kitchen roll a better filter than coffee filters or could you use a sieve instead?

You could set up different conditions in another experiment (e.g., 1 sheet of kitchen roll, 2 sheets of kitchen roll and 3 sheets of kitchen roll. What do you notice in the condition where there is more kitchen roll?

The Science: A filter is a porous material which a liquid can be passed through to separate the liquid from the solids suspended in it. First, the water is collected as rain and is then stored in reservoirs before it is treated. Next, it is screened to capture any branches or leaves. The water is then filtered to remove invisible particles and a small amount of chlorine is then added to keep the water safe. Finally, the drinking water is sent out along a network of pipes so we can drink it from the tap.

Please send in photos of your work via Google classroom or the office email address This email address is being protected from spambots. You need JavaScript enabled to view it..

Scientists of the Month

Our scientist of the month is Louis Pasteur.

Can you write some facts about this amazing Scientist?

Why is their work so important to us now?


You can also download our Science Challenge as a PDF.