Early warning signs of a developing main sewer line backup include multiple plumbing fixtures draining sluggishly or backing up simultaneously (such as water gushing into the bathtub when you flush the toilet or run the washing machine), persistent bubbling and gurgling sounds coming from floor drains and P-traps, foul sulfur odors wafting from plumbing fixtures, and toilets failing to flush properly. Verification: Inspect your main sewer line with a professional video camera scope at the first sign of simultaneous fixture sluggishness.
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