SUMMARY:With the help of building filters we can learn about the basic knowledge of filters
Step 1: Materials
1-liter soda bottles cut in half
Napkins or paper towels
Potable Aqua Chlorine Dioxide, water purification drops or tablets
Cups or scoops (for gravel and sand)
Activated Filter Carbon (available at pet stores)
Large water container for dirty water (pitchers or gallon jugs)
Dirty water (made by adding dirt, twigs, leaves, etc., to water)
Large waste container (plastic container or thick garbage bag for used filtering materials)
2 clean pitchers for clear water
Step 2: Procedure
Pre cut enough 1-liter soda bottles for each student or for each group of students
Create dirty water
Set up spots for scooping in the filter materials (charcoal, sand, gravel, etc.)
There should be a little hole in the bottle cap so that water can pass
1.Once you have made their filters, put the filter on a stable surface and pour in the dirty water.
2.You would observe that water is coming down in the second half of soda bottle and the water is clean.
3.When the whole clean water is drained remove the above part of soda bottle .
Step 3: Information
Gravel and sand remove large and small particles, carbon removes pesticides, chlorine and other chemicals and improves the taste of water.