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Fixing a broken water pipe looks like a dirty job. How is the inside of the pipe cleaned afterward?

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Fixing a broken water pipe looks like a dirty job. How is the inside of the pipe cleaned afterward?

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After work is done, the pipe is filled with water containing a large amount of chlorine. Holding this water in the pipe for a time kills all the germs. This is not the end of the story, however. The next problem is how to dispose of all this water that contains so much chlorine. Regulations control its disposal. A chemical must be added to react with the chlorine and destroy it before the water can be flushed out of the pipe and discharged, or the highly chlorinated water must be discharged to an area where it will not have an adverse impact on the environment. Further testing for the presence of potentially harmful bacteria is also done to ensure there are no health hazards present prior to the water being made available to the public.

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