A bathroom sink that runs sluggishly without a total blockage is usually restricted by a narrow lining of soap scum, body oils, and fine hair strands coating the interior walls of the P-trap. While water can still force its way through the reduced opening, overall flow velocity is severely impaired. Another common cause is an improperly adjusted pop-up stopper rod acting as a partial physical barrier. Verification: Remove the drain stopper and inspect the upper tailpiece pipe for hidden slimy residue.
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