2. Separation methods – 2.1 Plastic bottle for water purification (teacher instructions)

Experimentation instructions: Background information on the content and practical information on conducting the “Plastic bottle for water purification" experiment.
This model experiment demonstrates the natural purification process for contaminated water.
Many cities drain polluted water from rivers into the soil and recycle it as purified water from deep wells for further use as drinking water.
When water contains toxic substances such as fluorides, charcoal can be used as a cleansing agent.
Due to its porosity, charcoal has a large surface area that adsorbs unwanted substances and the filtered water can be used as drinking water.
This process is carried out in many African countries, as charcoal is a cheap filter material.
One item deals with „Technical application and vocational orientation“.