The way you ask this question is too broad.
Which part of your sewer pipe needs replacing? Exposed pipe in your basement or crawlspace is too simple for you to be asking about.
If you mean the sewer pipe that connects your house to the city sewer (generally under the street) you have a big task. Depending on what part of the country you are in, this section of your sewer pipe can be anywhere between 4 feet and 20 feet deep. In either case you'll need a backhoe to dig it up.
The cheapest way to replace a sewer line is typically through a method called trenchless sewer line replacement, which involves minimal digging and can be more cost-effective than traditional excavation methods.
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With a sewer line locator of course
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There are many specific methods and tricks to go about replacing a sewer line on one's property. the best way is to call a local service and have it done professionally. This avoids danger and hassle.
Either they are on a separate sewer line and connect to the main sewer line later on or they sewerage is pumped by means of a machine into the main sewer line.
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Snake the line
No. You vent air from a sewer line.
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