Most people focus on the obvious steps when preparing for a vacation: adjusting the thermostat, emptying the fridge, watering plants, and checking all the locks. But many overlook a small detail that often causes the stale, unpleasant smell many homes have after days or weeks of being empty — the sink. When no one is using the plumbing, the drain can become an unexpected source of odor and moisture.
Every sink contains a P-trap, the curved pipe under the basin that holds a small amount of water. This water forms a natural barrier that prevents sewer gases and insects from traveling up through the pipes. When a home is occupied, daily use keeps that barrier in place. However, when the house sits unused for several days, the water can slowly evaporate, leaving the drain open to odors and pests.
