Plastic bottles (cut in half).
Coffee filters or cotton balls. Craft knife, hammer and nail
Sand, gravel, and activated charcoal.
Dirty water.
Clean container.Build Filter: Layer coffee filters, sand, gravel, and activated charcoal in the top half of the plastic bottle.
Prepare Dirty Water: Mix dirt or other contaminants in water to create dirty water.
Filter Water: Pour dirty water through the filter and collect the filtered water in the clean container.
Observe and Record: Observe the filtration process and record the clarity of the filtered water.
Discussion: Discuss the importance of clean water and how filtration is used in real-world applications.