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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.

This is a comprehensive lesson plan on page 85 for a group cleanup trip to a local beach, lake or stream. Learners keep track of the types and amounts of trash picked up and analyze this information.

Water treatment on a large scale enables the supply of clean drinking water to communities.

In this activity, learners receive a labeled plastic film canister containing a material representing a pollutant (i.e. pencil shavings = a beaver's wood chips).