You can identify a clogged main drain by observing the behavior of your household plumbing fixtures. If flushing your toilet causes water to bubble up or overflow into your shower basin or basement floor drain, your main sewer line is severely restricted. Other indicators include multiple slow-draining sinks, gurgling sounds echoing through P-traps when water discharges elsewhere, and foul sewage odors spreading across lower living levels. Verification: Test multiple fixtures simultaneously to determine whether the obstruction affects the main sewer line.
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