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Connecting Saniflo Waste to a Shower Waste?

Discussion in 'Plumbing and Central Heating' started by rossyl, 21 Jul 2021.

  1. rossyl

    rossyl

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    Hi

    We are going to have to put in a Saniflo. It's going into a new ensuite.

    I'd rather not have the sink and shower running into the Saniflo, as hair is an added item to potentially clog them.

    I'd like to have a separate waste for the shower.
    But I would only like one pipe showing on the exterior.

    So I would like the Saniflo waste and the Shower waste to join under the floor, before they are external.

    Any issue with that, I am concerned that the Saniflo could pump the waste back into the shower.

    Is what I'm asking for simple, or fraught with difficulties?

    Thanks
     
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  3. Captain Nemesis

    Captain Nemesis

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    Picking out the highlights
    Yup.
     
  4. Harry Bloomfield

    Harry Bloomfield

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    Not an expert on such matters, but..... The Saniflo waste will be pumped under pressure and if the exit pipe becomes restricted the likely outflow will be via your shower or sink. It needs to go all the way separately.
     
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  5. jj4091

    jj4091

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    Another possibility is that when you flush the Saniflo it will suck the water out of the shower trap & allow smells to rise into the shower enclosure.
     
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  6. rossyl

    rossyl

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    All sensible, thanks guys.

    Guessing a valve on the shower waste would likely create potebeissues, if restricting directional flow?
     
  7. Mottie

    Mottie

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    In our downstairs loo we have a Saniflo. A Sanislim I think. It has entry ports for a basin and a shower. Pretty sure any hair will be caught in the shower trap rather than the actual macerator and in any case, surely any hair that makes it to the macerator will be chopped up with everything else. You can treat the macerator every so often with descaling fluid which should also dissolve any hair that builds up inside. You can also get dedicated hair catchers for shower wastes.
     
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  9. Madrab

    Madrab

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    Never have any other waste connected to the same waste pipe of a pumped outflow, always a recipe for disaster.
     
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  10. just pumps

    just pumps

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    Wouldnt connect a shower to the discharge pipe of a Sani but would a basin with a self closing valve. Hair can be a problem if it is tight curly hair or if the lady falls pregnant and descaler will not disolve hair nor will a macerator chop it up.
    Post #4 does not apply and all things considered it is not a good idea.
     
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  11. jj4091

    jj4091

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  12. Captain Nemesis

    Captain Nemesis

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    Or do some research on saniflo problems (also use the spelling 'saniflow'), and ask yourself if its worth the risk....
     
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  13. Saniflo

    Saniflo

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    Hi,
    We would suggest to keep them separate due to what people have said above about it could pull on traps, the high pressure potentially come back up the waste pipe from basin/shower and if you experienced blockages.

    If you have to still join them together then increasing the pipe size when joining them can help, also joining them together as far away as possible from the appliances can help reduce some of the issues from possibly happening but for best results we would keep them separate.
     
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  14. just pumps

    just pumps

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    Welcome along Saniflo, and where doing the above is not possible would you agree that joining from above rather than a side on joint and a self closing valve fitted above will help with the issue?
    PS What is the activation level on a Top nowadays?
     
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