- Joined
- 28 Nov 2010
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- 59
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i’ll keep this as short as poss. I have a saniflo (sanislim) in my ensuite (I know, don’t say it...had no choice) works fine but occasionally omits a bad smell (drain/methane type) it’s quite random. Have treated with bleach etc but it returns, then sometimes disappears or hangs around like the proverbial bad smell ! The discharge rises vertically approx 2.5m into roof in 22mm copper then into I think 32mm plastic and gravity falls to the stack top connection. Having done a bit of research etc is it possible that a syphoning effect occurs from time to time due to high drop on stack and poss draws water from traps ? With it being quite random ? If so could I fit a 32mm non return valve on the waste in the roof to help with this ? Into unit is shower, hand basin and toilet (strictly no number 2’s tho !) any help/suggestions gratefully received ! Cheers