When multiple major plumbing fixtures like a sink and toilet fail to drain simultaneously, you are dealing with a severe main sewer line blockage or a completely obstructed roof vent stack. Do not attempt DIY chemical treatments, as toxic wastewater can back up across your home. Callout type="warning" title="Hygiene Warning": Avoid using plumbing fixtures to prevent hazardous sewage overflow inside your living spaces. Verification: Contact a licensed professional plumber immediately to perform a main line video camera inspection and professional snaking.
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