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Make a water filter

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1. Cut the bottom off a two litre bottle and fill the nozzle with cotton wool. 2. Put the bottle upside down into the bottom of the cold drink bottle. 3. Put the washed sand into the bottle, followed by the washed gravel, followed by the washed stones. Put a clean cloth over the top. 4. Pour dirty water into the water filter and see what type of water comes out the bottom.5. Even though the water looks clean it should not be drunk. Add 1teaspoon of bleach to 20 litres of water and let it stand overnight to kill any germs. Then the water can be drunk.

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Make a water filter to clean dirty water.You need a two litre plastic bottle, scissors, cotton wool, dirty water, washed sand, washed gravel, washed stones and a clean cloth. Talk to your friend about what you discover.

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