Group discussion
Discuss in groups to nd out what is done to obtain drinking water from reservoirs.
Write your answer below.
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Water stored in reservoirs is carried away by big pipes to lter beds.When the water passes
through lter beds, soil, rotten leaves and other solid dirts are removed.
This process is called ltration of water.
In Mauritius, ltration is carried out at places such as La Marie, shown in Figure 17.
Figure 17 - La Marie Filter Beds
How does ltration of water take place in lter beds?
Let us investigate how we can make a model lter bed.
What you need
• some muddy water containing pieces of dry leaves
• a big plastic bottle (2L)
• clean big pebbles and small ones
• clean/washed coral sand
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