To eliminate a persistent sewer smell permanently, you must destroy the underlying source and restore mechanical vapor barriers. Pouring a large pitcher of water down the drain replenishes a dry P-trap, restoring the water seal that blocks rising gases. Additionally, using biological enzyme cleaners introduces active bacterial cultures that aggressively consume organic biofilm and sulfur-producing bacteria lining the pipe walls, eliminating the root cause of the foul odor. Verification: Confirm that the sulfur scent is gone by checking the drain opening after treatment.
1 votes
Marked as accepted