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Grab the coke bottle and the glass beakers

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Gather three different amounts of gravel and dirt

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With the first test ad a small amount of gravel and dirt

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With the second test ad a medium amount of gravel and dirt

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With the third test ad a big amount of gravel and dirt

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With the first test  add river water

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With the second test add river water

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With the third test add river water

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Record findings in a notebook, for example, use a layout that says test 1 and then how well it worked to filter etc

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Witch ever container wins we will use that filter and we will use that again and again until you can see the clear water

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May the best filter win!