Since water is so important to us, it is very important that the water we use should be clean.

　　Otherwise, we might get some of the diseases that are carried by water. Many microbes are harmful. They are so small that we cannot see them, These microbes must be removed or killed before the water is not clean. People who drink this water may get these diseases. Thus,

　　to provide people with clean water, the government purifies the water.

　　Purification is a long process and consists of three stages: storing, purifying and distributing. The first stage is storing.

　　Man­made lakes called reservoirs are used for this purpose. Water from the rains, other lakes, streams and rivers is collected in the reservoirs. This water is usually dirty and muddy.

　　In the second stage which is purifying,

　　water from the reservoirs is filtered in a special pond. Stones, sand and other unwanted tiny things are caught in it. After that, tiny microbes are still present in the water. These microbes are removed by “airing”the water and by adding a chemical substance called chlorine(氯)to the water. This kills all the microbes in the water. After this the water can be safely used for drinking.

　　The third stage is the distribution of the purified water to homes, hospitals, offices, factories and other places. This is done through a network of pipes of various sizes. These pipes must be make of a suitable material.

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