As mentioned above, every sink, tub and floor drain in your home contains a small piece of plumbing magic referred to as a P-trap. Most people have heard of the P-trap, but may not know that the curve of the P-trap wasn’t designed to catch lost jewelry or hairballs, but rather to hold water on purpose. The water within the P-trap creates a physical barrier between your home and the large sewer system outside. This barrier is commonly known as the “water seal” and provides a level of protection by blocking unpleasant sewer gases and odors from entering your home.
However, if you leave a drain unused for a sufficient amount of time, the water will eventually evaporate, eliminating the protective barrier created by the P-trap. At this point, you may begin to notice a bad odor or worse yet, unwanted critters may begin to enter your home.
Therefore, the reasoning behind the viral hack is valid. If you plan to leave your home for a significant period of time, you do not want your P-traps to dry out.
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