How to build a homemade water treatment plant in a bottle

Materials:

1. A 1.5 or 2 litres mineral water or Coke bottle

2. Scissors

3. Strainer

4. Two big glasses

5. Soil

6.Rotten leaves

7. Water

8. A piece of fabric

9. Cotton and gauzes

10. Sand, small stones, vegetal charcoal

Steps:

1 .  Remove the bottle cap and cut it along the middle line

2. Keep the upper half of the bottle, turn it upside down, and introduce the materials playing the role of filters in the following order: cotton, stones, sand, charcoal, fabric and gauzes. Rest the structure above one of the glasses

3. In the lower half of the bottle mix and stir the water with the solids playing the role of organic remains (soil, leaves...).

4. Pour the mixture in the other glass, passing it through the strainer

5. Let the liquid rest for some minutes. The solids will move to the bottom, wihile the dirty water will stay above.

6. Pour slowly the dirty water thourgh the bottle and filters

7. Wait some minutes. Look at the filtered water and compare it with the initial sample