A clean, fast-draining pipe can still emit foul odors due to an accumulation of decomposing organic slime, food particles, and bacterial biofilm lining the inner walls of the P-trap or overflow channel. Every time water flows, it splashes against this organic buildup, releasing foul-smelling sulfur gases into the room. Another common cause is a dried-out P-trap that has lost its protective water barrier, allowing sewer gases to vent directly into your living space. Verification: Flush the drain with an enzymatic cleaner and hot water to eliminate internal biofilm.
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