Standpipe

Discussion in 'Drain Cleaning' started by Ickledi, Jul 28, 2011.

  1. Ickledi

    Ickledi New Member

    Messages:
    2
    Location:
    Ma
    Newbie here so apologies if I am posting in the wrong section. In the last two weeks in our downstairs bathroom we have been encountering 5-15 tiny black flies. Very puzzled as to where they are coming from.

    My husband has thoroughly cleaned out the whole room, even taking the trap off the sink in case they were breeding in there.

    As a final resort on Sunday he took the cover off the washing machine and cleaned the trap out on that and ran vineger through the machine. Took the hose out of the standpipe and poured some enzyme based cleaner in the hose and the standpipe. Covered it with tape for three days and no bugs.

    Today we took the tape off and ran two loads of laundry. Low and behold tonigjt we are encountered with bugs again.

    Is it possible bugs are breeding in the machine or in the standpipe. I would not think so given the water pressure flowing through there. If so is it possible to clean the standpipe out or pour drano down there to clean out.

    At our wits end as to what to do here. Had thought about the pest person but worried they will spray which will clear it for a few days and they will be back again.
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,062
    Location:
    Cave Creek, Arizona
    did you pour water into the shower drain?
  3. cwhyu2

    cwhyu2 Consultant

    Messages:
    1,348
    Location:
    Cincinnati OH
    If your laundry is in the basement, check your floor drains to see if they have water in the trap.
  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,260
    Location:
    Land of Cheese
    Drain flies get in when there is a trap with no water in it. Cleaning things is nice, but the drain flies will move about no matter if it is clean or not. Often the culprit is a fixture that is not often used which allows the water in the trap to evaporate.
  5. Ickledi

    Ickledi New Member

    Messages:
    2
    Location:
    Ma
    The room only has a toilet, sink washer and dryer in it. There was goopy looking water in the trap which we vacuumed out this morning to see if something gross was in the trap. Nothing but some dirty water. The water did smell kind of gross. There is a bathroom above this room which our kids barely use. We just poured some hot water down there hj if that was what you were suggesting.

    We did go away from the house for a week and this started happening after we came back.
  6. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,387
    Location:
    Yakima WA
    This sure sounds like a dry trap. Perhaps a floor drain you have forgotten about?
  7. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

    Messages:
    679
    Location:
    Houston, Texas, United States
    No not a dry trap !
    I used to have the same problem what you need to do is pour a big pot of boiling water down all your drains except toilets,
    they will break so you use a couple of cubs of bleach into toilets to kill the pest eggs !
    They is why they keep returning give it a week then treat again if they are still around
  8. BizzyBeePlumbing

    BizzyBeePlumbing New Member

    Messages:
    23
    Location:
    Raleigh,Nc
    Is this room above a crawl space? If so, is there an odor? possibly a broken drain under this room?
  9. chrisf8657

    chrisf8657 New Member

    Messages:
    24
    Location:
    Phoenix, AZ
    IIRC (not an expert here), like BusyBee said, I've heard drain flies can also come from breaks in the main line. Seen several videos and documentaries that showed it.

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