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Build your own water filter

(with coal)
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Clean water which can be used for drinking or cooking is rare in many rural areas. Therefore, it is important for people not to waste clean water (water conservation) and also to know of simple ways to clean the water.
Please note: the water cleaned by this simple filtration method is NOT suitable for drinking, as it may still contain harmful components. However, it could be used for cooking or drinking after it has been boiled for at least 8 minutes.

Objective

Students understand how water is naturally treated through sediment filtration by applying the same method in a small scale experiment and adding charcoal for improved cleaning results.

Materials

• one big plastic bottle (e.g. 2 liter soft drink bottle)
• rubber band
• paper tissue or paper towel
• knife or strong scissors
• coarse sand
• charcoal
• gravel
• muddy water

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