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Foul smell downstairs when we flush upstairs

Discuss Foul smell downstairs when we flush upstairs at UK Plumbers Forums; Hello all, it's that time of the year again when plumbers can't seem to figure out the issue they were called in to check so I have to rely on ...
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    Default Foul smell downstairs when we flush upstairs

    Hello all, it's that time of the year again when plumbers can't seem to figure out the issue they were called in to check so I have to rely on the skills and experience of you lot!

    First floor flat + loft conversion where a Saniflo was installed. The Saniflo piping goes from back right corner of room all the way around, coming out on the front left side into the pipe

    There used to be a foul smell appearing without any activity on the first floor but it was occasional and it would be contained to the toilet area roughly speaking

    About 6 weeks ago, the Saniflo upstairs was used for a #2 causing a flood of bad smell downstairs which wouldn't go away for about 2 hours. We stopped #2 upstairs yet since that time, simply flushing the Saniflo (i.e. no #1 or #2) floods the 1st floor (all rooms give or take) in a smell of poo.

    The Saniflo engineer does not think it's his remit because the smell is not around the unit itself, or even on the same floor. He did recommend descaling the macerator every 3 months though.
    The plumbers (3 so far) can't figure it out and recommend a (expensive) process of elimination:
    -Adding trap to the washing machine: yet the smell appears when the Saniflo upstairs is flushed and is a relatively recent phenomenon, AND the washing maching is not even connected to the same waste pipe that the plumbers are suspecting of being the problem
    -Changing the piping connections to include a vent 1m over the converted room (check the last photo, one plumber asked for £1,200 to remove that cap and do the piping properly)

    Any solutions you propose? I can't logically understand how we flush upstairs and downstairs gets the bad smell....

    Thanks
    NisnoozFoul smell downstairs when we flush upstairs-20170104_113436.jpgFoul smell downstairs when we flush upstairs-20170104_113443.jpgFoul smell downstairs when we flush upstairs-20170104_113457_hdr.jpgFoul smell downstairs when we flush upstairs-20170104_113529.jpg

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    Default Re: Foul smell downstairs when we flush upstairs

    Is the Sanipro close coupled to the toilet pan spigot or is there a length of pipe between the two? If so how long is the pipe?

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    Default Re: Foul smell downstairs when we flush upstairs

    Just realised the smell is on the floor below not the floor when the sani is so it has to be with the piping.

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    Default Re: Foul smell downstairs when we flush upstairs

    Right... only which piping? did any of the pictures offer insight?

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    Default Re: Foul smell downstairs when we flush upstairs

    Picture 2, the White pipe painted Black going to the hopper, what /where is that from?

    Picture 3 being from the sani?
    Last edited by rpm; 04-01-2017 at 08:10 PM.

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    Default Re: Foul smell downstairs when we flush upstairs

    Picture 2, the White pipe painted Black going to the hopper is the washing machine pipe
    Last edited by nisnooz; 04-01-2017 at 08:44 PM.

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    Default Re: Foul smell downstairs when we flush upstairs

    Quote Originally Posted by nisnooz View Post
    washing machine
    Sorry I edited and asked another Q.

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    Default Re: Foul smell downstairs when we flush upstairs

    Picture 4 , it looks like an air admittance valve, I cant realy tell by the pic , has it always been there ?
    http://jdlplumbingandheating.co.uk/

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    Default Re: Foul smell downstairs when we flush upstairs

    absoluetly, pic 3 with the grey pipe coming into the capped waste pipe is from the Saniflo

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    Default Re: Foul smell downstairs when we flush upstairs

    Quote Originally Posted by townfanjon View Post
    Picture 4 , it looks like an air admittance valve, I cant realy tell by the pic , has it always been there ?
    If it is and the White pipe is from the sani, could a faulty valve cause the issue?

    (slight overlap with OP)
    Last edited by rpm; 04-01-2017 at 08:16 PM.

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    Default Re: Foul smell downstairs when we flush upstairs

    Quote Originally Posted by townfanjon View Post
    Picture 4 , it looks like an air admittance valve, I cant realy tell by the pic , has it always been there ?
    yes, it has been. this air admittance valve has been deemed the black sheep of the situation by the plumbers who came over but it's been there for 3 years... of course, not to say it couldn't have gone faulty... that's why I'm asking for your help on this forum
    Last edited by nisnooz; 04-01-2017 at 08:54 PM.

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    Default Re: Foul smell downstairs when we flush upstairs

    The idea for the valve is to let air in but keep the smell in the pipe . They are designed for inside ( unless sombody knows different ) roof spaces etc etc .
    Take it off , I bet it sorts it
    http://jdlplumbingandheating.co.uk/

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