I presume the setup is the U-bend meets the soil pipe which is encased in a concrete floor. The soil pipe then goes to the AJ outside to connect up to the septic tank?
It looks that way - is there another possible set-up?
It sounds as though the soil pipe does not have a proper gradient on it, so is not flowing properly leading to a build-up of smelly stuff. Flushing a few times is replacing this smelly stuff with fresh water.
Makes sense to me - I assume there's no straight forward way to introduce a gradient with a minimum of fuss?
I have a similar setup on my pipe (u-bend into soil pipe with a gap), but due to some last minute alterations, the soil pipe is above the concrete floor along the wall. I haven't had any smells out of it, so that is what makes me think it is the gradient. There's supposed to be a rubber seal on the u-bend that fits with the soil pipe (otherwise I'd be ankle deep in sh*tty water!), but maybe this wasn't fitted on yours? You could try poking a piece of wire down the gap and see if if hits the seal? If it doesn't or the seal is badly fitted, I suppose you could seal it up with some rubberised mastic? (But I'm not a plumber, so you'll have to wait for some proper advice on that!).
Thanks YM - I'll check for that seal tonight - could there be any potential problems in doing a DIY mastic job do you think?
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