Clearing an obstructed main sewer line requires accessing the main cleanout port outside or in the basement. Insert a professional motorized sewer auger or hydro-jetting hose into the cleanout pipe, feeding it forward until you encounter the blockage. Mechanically break through tree roots or heavy sludge, and flush the line thoroughly with clean water. For severe structural collapses or heavy root intrusion, hiring a licensed plumber is essential. Callout type="warning" title="Hygiene Warning": Wear heavy protective gear when handling raw sewage cleanouts. Verification: Perform a camera inspection to confirm the line is clear.
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