Key warning signs of a clogged main drain line include multiple unrelated plumbing fixtures backing up or draining sluggishly at the same time (such as water gushing into your bathtub when you flush the toilet or run the washing machine), persistent bubbling and gurgling noises coming from floor drains, foul sulfur odors wafting from plumbing fixtures, and toilets failing to empty properly during a flush. Verification: Inspect your main sewer cleanout or check basement floor drains at the first sign of simultaneous fixture sluggishness.
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