You can identify whether your main drain line is blocked by observing multiple interconnected symptoms across your home: slow-draining water in multiple unrelated fixtures (such as the bathtub, toilet, and sink backing up simultaneously), gurgling sounds coming from drain traps when wastewater empties elsewhere, foul sewage odors wafting from floor drains, or water backing up into the shower when you flush the toilet. Verification: Test multiple plumbing fixtures to determine if the blockage is isolated to a single trap or affects the main line.
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