If you expect to be away for several weeks or longer, another commonly recommended option is to pour a small amount of mineral oil into each drain after running the water. The thin layer of oil floats on top of the water inside the P-trap, helping reduce evaporation and allowing the water seal to last longer.
Although the viral hack is based on a real plumbing principle, experts agree that maintaining the water inside the P-trap and using appropriate drain covers are much more dependable ways to help prevent odors and unwanted insects while your home is unoccupied. Taking a few minutes to prepare your drains before traveling can provide greater peace of mind and help keep your plumbing system working as intended.
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