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Slow drain basin – no block

Discussion in 'Plumbing and Central Heating' started by Liam2020, 28 Mar 2020.

  1. Liam2020

    Liam2020

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    Slow drain basin – no block

    I have a bathroom basin with a really slow drain. I have taken apart the bottle trap cleaned and tested all works fine. I have used a hosepipe To blast water down the waste pipe without bottle trap connected and water can be heard training in the soil stack with no problems. I have also done this with the hoes seals in the waste as I thought it could be pressure build up. Still drained. I have also slow poured water in the waste, still fine. I bought a anti siphon bottle trap to test but still same issue.

    Can anyone suggest something that I’ve not tried? I’m pulling my hair out here. Thank you very much for your help!
     
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  3. terryplumb

    terryplumb

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    What type of plug in the basin ? Can the plug be removed totally or is it captive ?
     
  4. Liam2020

    Liam2020

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    It’s removed so no restriction. All clean, you can see bottom of trap.
     
  5. terryplumb

    terryplumb

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    Sounds like your pipework is partially restricted.
     
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  6. oldbuffer

    oldbuffer

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    Does the drainage pipework from the basin fall all the way to the soil stack? If not, could be offering resistance to low pressure flow of waste, but be happy to clear a hose pipe under pressure.
     
  7. Liam2020

    Liam2020

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    Wouldn’t that effect drainage from hose pipe? How ever I get water into the water waste pipe with trap disconnected it drains fine...
     
  8. Liam2020

    Liam2020

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    Yes from the basin under the floor 2m straight into the stack outside. Doesn’t share waste pipe.
     
  9. terryplumb

    terryplumb

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    Try a different trap , s trap or p trap which are better flowing than bottle traps . I don't know how slow your basin drains ,but from what you have told us it can't be that bad ??
     
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  11. Liam2020

    Liam2020

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    I’ve tired a standard bottle trap and an anti syphon bottle trap, both same issue. If I connect trap to basin but not to waste and turn on tap it flows out of trap perfectly...
     
  12. Hugh Jaleak

    Hugh Jaleak

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    Is the soil stack open vented or does it terminate in an Air Admittance Valve? Secondly, does the WC connected that stack flush ok, or does the level rise and slowly drop.
     
  13. Liam2020

    Liam2020

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    I believe it’s open. Bath and toilet no issues...
     
  14. Hugh Jaleak

    Hugh Jaleak

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    Only thing I can think of is there's some kind of pressure build up that's preventing the flow from getting away as it should. Often find this with a blocked sewer or stack, that's also capped off by an AAV, the air cannot be displaced by the water so has to find an alternatively route out. Other thing to check, has the waste pipe been pushed too far into the boss on the stack, and is touching the opposite side of the stack internally?
     
  15. CBW

    CBW

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    Any photos of setup?
     
  16. Madrab

    Madrab

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    Only way to sort it is to get access to the full length of pipe and section it and check each of the sections. Has it always done this or is it a more recent issue?
     
  17. Liam2020

    Liam2020

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    I know water can escape freely as tested with hose... it’s a head scratcher ;)
     
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