Dear Maintenance Men
08 March 2012
Dear Maintenance Men:
I have a bathroom sink that is slow draining. I have already snaked the drain and found no stoppage. When I remove the pop-up assembly and have an open drain, water whooshes down with no problem. However, with the pop-up in place, water backs up into the sink and drains very slowly.
Most bathroom sinks have an overflow hole near the top edge of the sink. This hole serves two purposes: (1) acts as a safety drain to keep the sink from overflowing should the water rise above a certain level in the sink; and (2) the overflow hole also serves as an air vent for the sink when the water levels are above the pop-up plug. The overflow hole allows air to escape through the drain and the water to evacuate more efficiently.