sand
cat litter
cotton balls
pea gravel/pebbles
cheesecloth with rubber band to hold it in place
You will need to bring a plastic water bottle. You will cut off the bottom 2 inches to serve as a cup, and you will use the rest to construct your filter. You may construct it in any way possible, but you must construct it in such a way that you make the water CLEAR. You may not chemically treat the water in any way. The winning group gets to raid Mrs. E's candy jar at the end of the period.
You will be working in teams of two - and ONLY two! You may choose your partner. Get together with them and brainstorm how you will construct your filter. In the answer to this journal, describe how you will construct your filter tomorrow during class and WHY it will make the water clear.