That is what i was thinking , didn't know you could actually get those.
is there any way to test if it is the vent thats the problem before i do change it?
Can't see the drop as waste comes off toilet into downward u bend and into horizontal under the floor. I cant take the floor up as when house was built they were morons and used huge floor panels instead of floor boards so to get under I would have to remove entire bathroom, laminate floor and...
the house; 3 toilets, 2 upstairs (both fine) 1 downstairs (the bad one).
downstairs toilet connected to horizontal waste all the way through the house to the vertical. toilet backs up right to brim (no blockage found).
i think its a venting issue as when the toilet backs up if you push the...