I'm going to fit a wc below the stairs on the ground floor of our semi, and attach to the same soil stack as the existing FF wc. Is there likely to be a problem with syphonage - such that when I flush the upstairs toilet, the ground floor toilet will gurgle? should I consider putting some kind of vent bypass pipe from the lower section of the stack? I vaguely remember learning about this, but have never seen it done. Perhaps it isn't necessary.
- Or will it be ok re syphonage?
- Is a Saniflo macerator a good idea, or is a conventional waste outlet better?
thanks Tony