Yes, you are required to flush the drain with warm or hot water according to product label instructions after a chemical drain opener like Drano has sat for the specified waiting time (usually 15 to 30 minutes). Running water for 3 to 5 minutes ensures that all lingering caustic chemical residue, dissolved hair, and loosened grease sludge are thoroughly 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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