Product Description
Award-winning video and lesson investigations on the topic of cleaning water. Key concepts include:
- The cleaning of dirty water can be investigated with simple equipment.
- Passing dirty water through materials are better at cleaning than others.
- Different materials can be used as ‘filters’ and can include rocks, charcoal, sand, cotton-wool, and cloth.
- The closer together the filtering material is packed, the finer the particles that can be filtered out of it.
- Looser materials remove large impurities; finer materials remove tiny impurities.
- Testing materials and comparing results enables good filters to be identified.
- Tests need to be ‘fair’ to ensure reliable results.
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