Sink without overflow drains very slooooow!!

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by endwrench, May 24, 2014.

  1. endwrench

    endwrench New Member

    Messages:
    6
    Location:
    Maine
    Hi,
    so I bought what I thought was a very good deal at my local Home Depot to replace a vanity in my bathroom as we were doing a complete remodel.
    Install went as planned, but over time, we discovered that this sink started draining slow. I tried plunging it out and this
    did seem to help, but over a short time it had gotten slow again. Recently after looking this thing over closely and considering
    the venting and all, I found that this sink does not have a vent line to the drain spout as the previous one did.
    I've considered adding an air admittance valve, but I don't know if this is the best option or not and if this will meet code. I think what I am going to do
    is just replace this with a vented sink and be done with it, mainly because the Armstrong flooring we out down is starting to
    turn colors and now I have to pull the vanity and replace the flooring, oh what fun.......

    Thanks for any input and/or suggestions.

    endwrench
  2. Smooky

    Smooky Member

    Messages:
    569
    Location:
    NC
    Are you talking about a vessel sink? If so they do drain slowly but if you plunged it and it got better, then that is a separate issue.
    Last edited: May 24, 2014
  3. Terry

    Terry Administrator Staff Member

    Messages:
    14,794
    Location:
    Bothell, Washington
    A lav basin without the overflow can drain very slowly unless it has the special drain for that purpose. They now advertise for just that purpose. Some have a pop-up drain that goes higher, and some have a domed grid with larger spaces.
    In the past, the overflow, which allowed air to get sucked past, that entered back again just below the stopper made the difference. I would try the new drain first.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,292
    Location:
    Cave Creek, Arizona
    IF we are referring to the same item, you mean an overflow opening in the sink and that is an entirely different situation than "no vent" and an admittance valve would be completely useless.
  5. endwrench

    endwrench New Member

    Messages:
    6
    Location:
    Maine
    Thanks, I apologize for the confusion of terms, I may have misled. I guess you would say that the old lavatory had an overflow, but this apparently
    was enough to let the air in so it drained quicker. Just for fun I put a straw into the drain one day and it did help, so it seems to be more of a vacuum
    issue than anything else at this point. Otherwise it drains fine. I think that the plunging just cleared the pipe of any debris and momentarily helped the flow.
    With the slowness of the drain, it probably cause more gunk to stick to the pipes instead of rinsing it through.

    Terry, I'll do a search for the newer style of drain and see what that will net me. Thanks

    endwrench
  6. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,072
    Location:
    Maine
    Have the drain professionally cleaned.
  7. endwrench

    endwrench New Member

    Messages:
    6
    Location:
    Maine
    I think that the reason for the drain getting better after I plunge is because it temporarily pushes the water out of the trap, so it is clear to refill again. The line should be fairly clear, it's only been in use for a couple of years.

    Endwrench
  8. Reach4

    Reach4 Active Member

    Messages:
    1,921
    Location:
    IL
  9. Smooky

    Smooky Member

    Messages:
    569
    Location:
    NC
    What type of drain is in the sink? If it is the strainer type with small holes, air gets trapped inside between the strainer and the water in the p-trap. That bubble of air traps the water in the sink, so it drains very slowly. A different type of drain may allow air to escape faster and allow the water to drain out faster.

    http://www.houzz.com/photos/552100/...p-Drain-contemporary-bathroom-sinks-charlotte
    Valve to let the trapped air out
    http://ths.gardenweb.com/forums/load/bath/msg1100324329325.html?18
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