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Question- How can we purify the dirty water. Hypothesis- Filtering water through sand and gravel will filter out all harmful substances in the water. Procedure- Step One- Obtain sand, gravel and charcoal, filter paper, Erlenmeyer Flask, and water bottle. Step Two- Place the filter paper inside the water bottle. Step Three- Add Gravel, sand and charcoal layer by layer until you have two of each. Step Four- After water in filtered, measure the volume of the purified water. Step Five- Repeat step four until all oil and substances in water is gone and water is clear. Step Six- Boil purified water.