To address a backed-up main sewer line, stop using all indoor plumbing fixtures immediately to prevent further wastewater overflow. Locate your main sewer cleanout access pipe in the basement or yard, and hire a licensed professional plumber to perform motorized snaking or high-pressure hydro-jetting to clear the blockage. Following physical clearing, request a video camera scope inspection to verify that the pipe is structurally sound and free of root intrusion or collapse. Verification: Run multiple household fixtures simultaneously after professional clearing to confirm smooth, rapid drainage.
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