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Slow draining sink

Discussion in 'Plumbing and Central Heating' started by Wonderhorse, 12 Jun 2020.

  1. Wonderhorse

    Wonderhorse

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    My daughter has a kitchen sink that takes a long time to empty.

    I disconnected the pipes under the sink, there's no blockage in them.

    See the photos attached, I've checked on-line and I haven't seen any examples of sink pipework/traps that look like this. After the trap it seems like the pipe is too high, almost as high as the plug hole.

    Do you think this maybe the problem or is there maybe a slight blockage further down the pipework?

    Thank you in advance.
     

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  3. just pumps

    just pumps

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    Sorry to say that is complely wrong. At the moment you are asking the weight of water in the sink to push other water upwards.
     
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  4. Wonderhorse

    Wonderhorse

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    I'm glad to learn of that, it just didn't look right, thank you.

    If I was to swap the waste out and replace with a bottle trap, like this below, would that do the trick?

    Problem is, the pipe coming away from the bottle trap needs to go downhill and I'm not sure it will be able to because there is a fixed grey pipe (you can just about see at at the far right of the picture) running behind the kitchen units.

    I'm guessing that's the reason the plumber did it like that in the first place, any advice would be appreciated?

    Thank you.

    [​IMG]
     
  5. just pumps

    just pumps

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    Most decent plumbers wouldn`t use a bottle trap under a sink. Look for an adjustable trap and for my money McAlpine have a decent website and products.
     
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  6. just pumps

    just pumps

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  7. Wonderhorse

    Wonderhorse

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    I'm guessing this?
    upload_2020-6-12_17-16-35.png
     
  8. Wonderhorse

    Wonderhorse

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    We must have been searching at the same time, thank you.
     
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  9. just pumps

    just pumps

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    looks good, try and keep the spigot for the washing m/c point up. it stops sink water trying to fill the grey pipe.
     
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  11. Hugh Jaleak

    Hugh Jaleak

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    That's a Bath trap by the look of it currently fitted, as said, needs swapping out for a decent P trap. Ideally you could do with lowering the waste pipe too, away from the sink, where does it go to?
     
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  12. Normal for Norfolk

    Normal for Norfolk

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    The grey waste pipe runs behind the kitchen units, I'm not sure where it goes exactly, I'll need to take a look next time I'm there. I'm hoping I can get a fall to that grey waste pipe after I've fitted the new trap, otherwise I guess the kitchen units will need to come out and then hopefully I can lower that grey pipe slightly.
     
  13. Madrab

    Madrab

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    Yup, it's a 50mm seal bath trap that's been used, probably because of the level of the outflow pipe going through the wall.

    Whilst it's not the proper option for a sink it shouldn't really be causing an issue as far as draining is concerned. That may be down to the level of the outflow through the wall and/or a possible restriction in the waste pipe run somewhere. Any other trap you may fit might need the waste pipe to run uphill at some point, to get to the outflow pipe.

    It does need changed to a proper trap but I'd also investigate the pipework further down for any restrictions and see if the outflow pipe through the wall can be dropped further down the wall.
     
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  14. Wonderhorse

    Wonderhorse

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    Apparently it’s been slow to empty since she moved in 2 years ago, still doesn’t rule out a partial block further down the pipe I guess.

    Is it okay if it runs up hill at some point then?
     
  15. Madrab

    Madrab

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    Nope, that will slow down the drain. The trap that's there at the momnet is designed so the highest point of the trap is still at the same level as the waste outlet of the sink(bath), therefore it's not really traveling uphill as it heads down the same distance first. They have only fitted that bath trap to that sink setup to obtain a decent fall on the rest of the waste pipe heading to the outflow

    If you use a regular P or bottle trap then the exit pipe from the trap may actually be level or lower than the outflow through the wall and that's a recipe for trouble as it will all have to travel uphill.

    Are you able to give us a pic of the whole length of the waste pipe from the trap to the outflow pipe through the wall so we can see where the height of the outflow is in relation to the trap? If not can you measure the height from the cabinet base to the bottom of the pipe heading out through the wall and the height from the same cabinet bottom to the bottom of the waste (the white inverted cone attached to the bottom of the sink that the current trap is connected to)
     
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  16. Normal for Norfolk

    Normal for Norfolk

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    Thanks for the reply Rob.

    I'm hoping to get back there next week and I will look at heights of pipes, check out the access to get at the pipe etc
     
  17. just pumps

    just pumps

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    How come we have two usernames making out they are the OP?
     
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