Monday, 10 January 2011


An activity that can be done as a class experiment. Just make sure materials and equipment are available for the students. If not readily accessible in your school, ask groups to bring in materials.

This activity can be used when discussing about the importance of water. As a springboard of the topic, prepare pictures or powerpoint slides on water pollution, water scarcity in different parts of the world, sources of water, and etc. When it rains, water penetrates into the ground and as it passes through it, the water is filtered by the rocks, and sand, and soil, and eventually comes out as clean water at a spring or wells.



* 500ml plastic drink bottle ( with the bottom removed)
* small stones
* sand ( soil can be used, but not as good as sand)
* moss
* ruler/ wooden stick
* 100 ml muddy/dirty water to filter (you can prepare this by mixing soil and clean
* 250 ml beaker (or drink glass)
* stand and clamp


1. Push some moss into the bottle and use the ruler/wooden stick to push it down
2. Clamp the bottle upside down into the stand
3. Put a layer of sand on top of the moss
4. Put some small stones next to the sand enough to create another layer.
5. a to c makes up your water filter
6. Carefully pour the dirty water through your filter and observe. If the first lot of water looks a bit muddy, try it again,


You may ask the students to make a diagram of the experiment and ask them to label each part correctly. Let them explain the importance of each part.

Note: If you have any questions or suggestions regarding this activity, you can reach me at my email in the Contact page.

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