Water Filter Experiment
Aim/ Purpose -
To filter or clean water using a number of materials
How to clean/filter water - making it clean
Materials -
Sand,
gravel,
activated charcoal,
cotton wool,
plastic bottles cut in half,
bucket of dirty water (can make the water dirty with soil or whatever from outside)
Predictions - What is going to work best? What steps/process and in what order - why?
Cotton wool at the bottom - It will absorb the smaller dirt particles from the dirty water
2nd layer up - gravel - The gravel will grab onto the dirty parts and the clean water will drip off the gravel through the gaps.
Second Layer Up - Charcoal - The second smallest material, can absorb the things not cleared by the bigger materials.
Third Layer Up - Sand - Turns hard when it’s wet - Take all the bigger dirt particles
Top layer - Gravel - All the hugest dirt particles out first.
Method/Steps:
Firstly we put 3 cotton balls in the top half of the cup.
Then we put a sprinkle of charcoal on top of the cotton balls.
After that, we put in a few spoons of sand
Lastly, we put in some gravel
Explanation - How did it work?
The gravel takes all the large pieces out of the water
Then the sand to take and pieces that have passed the gravel and the sand hardens.
The charcoal absorbs tiny particles of dirt and other things
The cotton wool holds everything from falling through
Why is it important for cities/towns etc to purify and clean the water before it gets to peoples’ homes?
In New Zealand cities and towns, clean water is pumped straight into our homes. We have systems in place to monitor how safe our water is for drinking, and to manage what happens. It also helps to stop illnesses and catches algae and bacteria.
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