There is nothing worse than a problem-causing drain. They are simple things, drains. We do not ask them for much—except to not cause any problems. Generally, we humans never think about our drains. Normally, our thoughts are entirely drain-free. But when a formerly well-behaved drain suddenly turns into a problem-causing drain, why, it needs to be studied. “How come,” we wonder, “is this drain suddenly causing problems? Bad drain!”
