A shower drain that runs sluggishly without being completely blocked is typically caused by a buildup of hair, soap scum, body oils, and mineral residue lining the interior walls of the P-trap pipe. This organic sludge narrows the internal diameter of the drainpipe, restricting water velocity and slowing down drainage without creating a total impenetrable blockage. Verification: Remove the drain strainer and pull out trapped hair using a plastic zip-it tool or wire snake.
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