According to the charity Water Aid, 768 million
people around the world don’t have clean drinking water. Drinking dirty water can help to spread
diseases and make you feel very ill.
Why not test this way to clean water using a
You will need:
- elastic band
- 1l litre plastic bottle
- 2 cotton wool balls
sand, fine gravel (the size used in the bottom of a fish tank) and
mixed gravel (from a driveway or garden).
Don’t forget to
ask permission before taking the gravel!
- Use the bucket to collect some rain water from your garden
- Cut approx. ½ off the top of the bottle.
- Place the coffee filter over the top of the
bottle and hold in place with the elastic band.
- Squash the 2 cotton wool balls into the neck of
the bottle so that it sits on the coffee filter.
- Now add the play sand on top and fill to a
- Fill the next third with the fine gravel and
then fill to top with the mixed gravel.
- Carefully hang your water filter above a clean
jug and pour some of your collected rainfall water into the top. You
may need to do this twice.
- Now compare it to some unfiltered water, what
do you notice? What differences can you see?
- The different layers help to trap the dirt
leaving clean water in the bottle. Remember although the water looks
clean it is not safe to drink.
- Why not try separating each layer and seeing which the best at
filtering water is?
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