After applying a chemical drain opener like Drano, you should wait the exact duration specified on the product label (usually 15 to 30 minutes), and then flush the drain by running hot tap water continuously for 3 to 5 minutes. This extended flushing ensures that all lingering chemical residue and dissolved debris are completely washed down through the P-trap and out into the main sewer line. Verification: Inspect the drain opening to confirm no residual chemical pooling or pipe corrosion is present.
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