Think Outside the Bottle (view)

Units included with this Open Author resource:

Lesson Plan
Density, PASTEM, Stem, Water Filter
Teaching Strategies
PASTEM, water filter, stem, density
Prepare For Lesson
Student Handout


The Challenge: The challenge is to design and build a water filtration device using commonly available materials. To meet this challenge, students use an iterative repeating process as they build, test, and measure the performance of the filtration device, analyze the data collected, and use this information to work towards an improved filtration design. It is the same design process used by engineers and scientists working on ECLSS for NASA. Although students will work in teams of two–three, they are encouraged to think of their entire class as a single design team working cooperatively and learning from the efforts of all members in order to produce the best water filtration device. Students measure the effectiveness of their filtration device using pH test strips. Detailed plans and a complete materials list are provided.