Bathroom Sink Blockages

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First Aid for the Bathroom


Dear NH,
Lately I have noticed a foul odor coming from the drain of my bathroom sink. I have used several drain cleaners thinking that it may be hair clogging the drain. However, this has not solved the problem. Also, when the sink is filled with water, it is slow to drain. Any ideas?

Dear KJ,

Most bathroom drain slowdowns and blockages start at the popup assembly, not at the trap or in the other drain lines. First, a brief description of the popup assembly. The stopper in your sink moves up and down by means of a metal rod that extends into the drain pipe right beneath the sink. This rod pivots when the popup handle is moved, raising and lowering the stopper.

The culprit is the metal rod. Because it extends into the "line of fire" of all the waste leaving the sink, it collect bits of hair over time. This mass of stuff grows ever larger until it eventually slows down sink drainage or causes a full-blown blockage. Unfortunately, drain cleaners will not dislodge this stuff... they can make it even more stinky! Partial disassembly of the popup mechanism may be necessary to remove the stuff.

The first step is to extract the stopper from the sink. If it pulls right out, you are in luck. Sometimes you can use a long screwdriver to push the blockage through. Then simply flush the drain with a few gallons of very hot water.

However, if the stopper does not just pull out with a gentle tug, it is interlocked with the popup mechanism. You will have to unscrew the popup rod under the sink, which is holding it in place. If you look underneath the sink with a flashlight, you will see the linkage that operates the stopper. Unscrew the large nut on the side of the popup assembly (you may need pliers or a wrench), and pull out the rod, which will free up the stopper. It is alright to bend the linkage slightly to do this... just don't bend it any more than necessary to release the popup. When you are done you can bend it back.

(A note... when disassembling the popup mechanism, don't lose any of the small washers! They must be reassembled in the original order and direction or you will have leakage around the rod and nut.)

As I said, you will probably find lots of gunk on the stopper and the metal rod that drain cleaners will not remove. In fact, they seem to make it even more stinky! Pull out or push through what you can from the drain and clean the popup. If the blockage is too thick, you might have to disassemble the trap to get it all out.. The trap is an "elbow" under the sink that holds a small amount of water all the time. This standing water acts to block sewer gas from seeping into your home through the drains.

After reassembly of the popup mechanism, apply some lubricant, such as plumbers grease, to the threads, seals and the pivot ball on the popup rod. It will improve the action of the popup and make the next disassembly easier.

Flush the pipes with a few gallons of very hot water to be sure all matter has washed through to the larger drain pipes beyond the sink drain. Please... don't forget to reinstall the nut under the sink first, or the water will drain inside the cabinet!

As a "prophylactic" against future blockages at the popup, try to get into the habit of filling and draining the sink with very hot water every week or so. Due to the proliferation of low-flow faucets, most bathroom sinks have only low volumes of water running through them. This can cause the collection of all sort of stuff in the pipes... especially if you have a long sloped drain pipe running from the sink. This boost to the flow may help!

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