A shower drain typically runs slowly due to an accumulation of hair, soap scum, body oils, and mineral residue adhering to the inner walls of the P-trap and vertical drainpipe. Over time, these organic materials intertwine to form a restrictive sludge layer that narrows the internal diameter of the pipe, impeding water velocity and causing wastewater to pool in the shower pan rather than exiting freely. Verification: Remove the drain cover and inspect the upper pipe opening for visible trapped hair and slime.
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