We moved in about ten years ago and the downstairs WC was old fashioned but functional. A year or two later we updated it with a cheap, modern low flush replacement. Since then, we have been plagued by on and off sewage smells from the toilet! It seems to be worse at night and when it rains, although it doesn't always do it and we can go for weeks without issues. I have had three plumbers look at it, all of whom were stumped and can't find any obvious issues. One replaced a seal in the waste pipe and insisted that would fix it; it didn't. I've asked if a vent could be blocked somewhere but they all say it's unlikely and don't investigate further. We are now having that room fully renovated and the fitter said it could be something to do with the angle the waste pipe is fitted at (or downstairs is slightly lower than the pavement outside) and thinks replacing the toilet and checking the waste pipe will be the solution. Does anyone have any advice? I keep our home really clean and am starting to find this very stressful, as silly as that might sound!
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