Equipment you’ll need:

• Four plastic cups with holes in the bottom
• One plastic cup with no holes in
• Four cardboard rings to support the cups
• Filter paper
• Activated charcoal
• Sand
• Gravel
• Dirty/muddy water

Method:

• Fill four plastic cups with the materials, leaving small holes in the bottom for the water to filter through
• Leave a fifth cup empty, this will collect the water at the bottom
• Place a cardboard ring around the top of the empty cup to support the next cup
• Next, place the filter paper cup on top
• Followed by the charcoal
• The sand
• And finally, the gravel

• Pour dirty water into the gravel cup
• Wait, patiently, as it filters through your treatment system
• Observe the clean water collected in the bottom cup
• Place the cup alongside the dirty water to compare