How are sewer lines maintained?

Sewer lines are systematically cleaned using high-pressure jet nozzles that scour the sewer lines of grit and grease debris that is then vacuumed out and disposed of at the treatment plant. An inspection camera is also used to view the inside of the sewer lines for evaluation purposes to determine line repair or replacement.

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1. Is it okay to dump grease down my house drains?
2. Is it okay to dump car oil down the sanitary drain system in my house?
3. Is it okay to flush plastic items down the toilet?
4. What is this manhole for in my back yard?
5. What should I do if I see liquid flowing out of a sewer manhole?
6. How are sewer lines maintained?
7. How does the treatment process work?