What is the silt in the water system after flushing?

Water naturally contains minerals. These minerals normally and naturally react with the inside of the pipe to produce the silt by-product. The process can occur on the inside of the pipe and eventually cause the water quality to deteriorate, or cause taste or odor problems. Hydrant flushing removes much of this by-product. However, not all of it can always be flushed out. Some may still remain in the water, causing some discoloration until it again settles. 

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1. Why does the water system need to be routinely flushed?
2. When does flushing normally occur?
3. What should I do after a nearby hydrant is flushed?
4. What should I do if my water pressure or volume seems low after the hydrant flushing?
5. Why does the water look discolored after hydrant flushing?
6. Is it OK to drink sediment-laden or discolored water during temporary disturbance events such as hydrant flushing?
7. What is the silt in the water system after flushing?