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How to Fix a Slow Draining Bathroom Sink

Watch Video on How to Fix a Slow Draining Bathroom Sink

A slow draining bathroom sink is one of those slow-onset, insidious annoyances that many of us tend to ignore until the sink has reached a painfully slow crawl. Thankfully, resolving the problem can be done in just a few simple steps.

Warning: the video does depict some gross contents in the drain!


Don Kennedy, President of ProMaster Home Repair & Handyman of Cincinnati, walks you through how to disassemble and clean both the p-trap and popup in your bathroom sink drain. This bathroom repair is simple enough that most homeowners can perform it themselves without requiring any specialized tools.

Let ProMaster Fix My Bathroom Sink

Slow Draining Bathroom Sink

Slow Draining Bathroom Sink

Cleaning the slime out of a bathroom sink drain is no fun. But neither are the enormous repair bills from an overflowing or leaking bathroom sink. Hire a pro if this project is something you aren’t comfortable tackling on your own—and enjoy the peace of mind knowing that your sink drains and water supply lines won’t be springing a leak!

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  1. Great video guys. I'd rather it be you under the sink than me… I'm too old for this stuff! Not to mention I hate cleaning the hair and junk out of my drains.

  2. Don – After watching the video about bathroom drain cleaning, I am actually excited about giving it a try. Please have one of your Master Craftsman on call this weekend as my plumbing efforts usually result in some kind of disaster like leaky pipes that were not leaking before I started the project. Thanks for the info!

  3. Drew–I believe in you… YOU CAN DO IT!!! (But… if something does go wrong, you can still give me a call and I won't say anything about it to anyone). 🙂

  4. thanks for the post

  5. Sorry guys, I took most of the plumbing out from under the sink (except the part that goes into the wall)–cleaned all the gunk out, and the drainage problem is not much better than before.

  6. I had same problem, based on this video I cleaned the P-trap and everything else. Not much gunk. Assembled an tried – no improvement. When I tap on the drain stop, then a bubble comes up and then the flow is fast. What else could be wrong? Thanks

    • Khwaja,
      It sounds like there may be a back-pressure problem. You might want to have the vent stack checked for blockage. If this is a new house, it is possible that the vent caps were never removed after the system was pressure tested.

  7. Angie Wishart says

    Need your help rusted pipe under sink vent to roof bad sewer vent

  8. Michael says

    Great video! Thanks for the help

  9. Can’t get the drain to attach to sink. Trouble getting popup and drain to screw back together.

  10. Debbie Cooper says

    We had a slow moving bathroom sink and my husband checked the p trap and didn’t find a clog but we still had the problem. I found your video and told my husband what the problem could be. He didn’t agree but disconnected the plunger to quiet a nagging wife. The plunger was filled with hair, hink and even paper towel. We now have a fast draining sink. Thank you for posting that video.

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