| It is quite difficult to remove glued toilet flange.
You can proceed as Letmetellu suggested. Also, you may consider drilling directly into the concrete, epoxying new bolts in pre-drilled holes and set toilet onto these bolts.
You can also purchase new, retrofit, ABS toilet flange that fits inside existing pipe. In this case, you can cut off existing flange, insert the new one, bolt it into the sub floor / slab and install toilet on top of it. |