4 ms·

The traditional U-trap can fail if abandoned or isn't used regularly too. The water eventually evaporates.

• eru 16y ago
  Happened to me regularly when returning from summer holidays.
  • ars 16y ago
    To prevent it, put a small amount of mineral oil (baby oil) in the trap. It will float on top and prevent the water from evaporating.
    • eru 16y ago
      I guess vegetable oil should also work? By the way, I heard of the same trick for keeping water in your vases.
      • deleted 16y ago
        [deleted]
      • ars 16y ago
        Vegetable oil will oxidize and turn into a sticky mess.
        • eru 16y ago
          OK, thanks.