This PowerPoint contains information about water testing model in which it gives information about design and materials used to develop water testing model….
3. Water testing
• In order to check how clean and safe water is
we need to test it.
• Water testing practical was run by Home and
health teacher.
4. Materials
Sand
Large stone
Soil Gravel
Or rice husk...
Broken Bricks Coconut shaving Pebbles
5. Materials
• Need to be clean
• Low cost
• Improve the quality of water
• Layered
6. Exercise
• Use the filter available and experiment with
different layers of materials.
• Place 1 Litre of water through filter.
• Test the water before and after testing. Make
conclusions about the layers.