- If you were to look at bandana material with a magnifier, what do you think you would see? Make a sketch to show your ideas. How does the structure of the fabric help to separate substances in dirty water?
- What other materials could be used to filter water if you were on a deserted island?
- What other materials could you use if you were going to do this experiment in your classroom?
- Particles of dissolved salt are so small they pass through the holes in the soil/bandana filter. How could you remove the salt from the dirty water?
- Find out how a septic system uses rocks, soil, and sand to treat waste water. In addition to the earth materials, how do bacteria in the soil help with the cleansing?
