Question 20
In pairs, create a homemade filter to clean some dirty water.
Fill a funnel with stones, sand and paper. Fit the funnel over the mouth of a clean plastic bottle. Pour the dirty water through the layers and allow the water to collect in the bottle. Observe what happens.
Do not drink the filtered water as harmful bacteria may still be in the water.
Fill a funnel with stones, sand and paper. Fit the funnel over the mouth of a clean plastic bottle. Pour the dirty water through the layers and allow the water to collect in the bottle. Observe what happens.
Do not drink the filtered water as harmful bacteria may still be in the water.
