1. Place a filter on a cup(making sure it won't fall off)
2. Put 250 mg of sand in the filter
3. Measure out 250 mL of oil in the measuring cup
4. Pour the oil onto the sand and let the oil be filtered for 60 seconds
5. Remove the filter from the cup after 60 seconds of filteration
6. Record the amount of oil in the cup on a table
7. Subtract this amount from 250 to find out how much of the oil is actually absorbed by the sand
8. Record this number on the table as well
9. Repeat steps 1 to 8 with oil and clay instead of sand
10. After one week, repeat steps 1 to 9 but instead of oil use petrol
11. After another week, repeat steps 1 to 9 but instead of oil use engine coolant
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