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  • Do all the wastes go into one external vertical pipe? A soil stack. This should be open or vented at the top or the rush of water from your Loo can suck air through a bath/shower/sink U-Bend.

  • Yep that's right. There is a vent on the top of the stack. We had a loft conversion done about a year ago, but this gurgling has just started within the past couple of weeks.

    We can all use the outside toilet, it's pretty refreshing at this time of year

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