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Cleaning with Dirt
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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.
Clean Water: Is It Drinkable?
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In this activity, learners simulate nature's water filtration system by devising a system that will filter out both visible and invisible pollutants from water.
Giving Water the Treatment
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In this ecology activity (page 8 of the PDF), learners explore how to filter contaminated water using a variety of materials.