bath waste pipe flooded by saniflo waste in roof

[Unregistered]

Removed a bath and basin in upstairs bathroom waste pipes not capped. Saniflo connected into soil stack in roof not bossed just open hole with elboe inside soil pipe drainage not blocked, yet when saniflo was used some how back fed into bath waste in room below. Im guessing the elbow inside the stack directed the waste catching the edge of the bath waste boss. Any other thoughts?

 

[Unregistered]

Removed a bath and basin in upstairs bathroom waste pipes not capped. Saniflo connected into soil stack in roof not bossed just open hole with elboe inside soil pipe drainage not blocked, yet when saniflo was used some how back fed into bath waste in room below. Im guessing the elbow inside the stack directed the waste catching the edge of the bath waste boss. Any other thoughts?

(Elbow - spell check)btw saniflo waste connection found on investigation not installed by me.

 

[PlumbBobBob]

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