isn’t a substitute for maintaining the plumbing trap itself.
The Important Part Is the P-Trap
Under most sinks is a curved section of pipe known as a P-trap.
Its design allows a small amount of water to remain inside the plumbing.
That water acts as a barrier between the room and the drainage system.
You can think of it as a simple plumbing “seal.”
When the trap contains water, gases from the drainage system generally have a much harder time entering the room through the open drain.
