However, it will be years before the river flows clear and clean again. In the meantime, you and your colleagues at the Public Works Department have been assigned the task of developing a more efficient water filtering system. Funding has been cut, and the materials you have to use in your work are limited. Display the materials. Consider and discuss the uses of each of the items.
Students note their ideas and predictions concerning the task in their journals.
Teams carry out their investigations and record observations in their journals. Provide paper towels for clean up. Dispose of rubber gloves when finished. Teams present their filters to the class. Students discuss their investigations, proposing explanations and conclusions.