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    Perkins School for the Blind
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    This activity was designed for blind learners, but all types of learners can explore means of physically separating a mixture using dissolving, filtration, and evaporation. Separating a sand/salt...

    $1 - $5 per group Ages 11 - 18 10 to 30 minutes
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    Twin Cities Public Television
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    In this quick activity (located on page 2 of the PDF), learners will model how wetlands act as natural filters for the environment. Learners prepare a mixture of water, soil, gravel, and leaves and...

    $5 - $10 per group Ages 8 - 14 10 to 30 minutes
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    WGBH
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    In this engineering activity, challenge learners to invent a water filter that cleans dirty water. Learners construct a filter device out of a 2-liter bottle and then experiment with different...

    $1 - $5 per student Ages 6 - 11 10 to 30 minutes
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    University of Nebraska State Museum
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    In this activity (on pages 29-35), learners examine water pollution and filtration. First, learners build models of water bugs from paper clips, and test the effect of dirt and detergent on their ...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    New Jersey Department of Education
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    Water treatment on a large scale enables the supply of clean drinking water to communities. In this activity, learners develop methods to clean a polluted water sample, describe components of a...

    $5 - $10 per group Ages 11 - adult 45 to 60 minutes
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    American Chemical Society
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    In this activity on page 7 of the PDF, learners make their own water treatment systems for cleaning water. Learners construct two filters to test: one with sand and one with sand and charcoal....

    $5 - $10 per student Ages 8 - 14 45 to 60 minutes
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    Lunar and Planetary Institute
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    In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water...

    Over $20 per group Ages 4 - 14 10 to 30 minutes