I'm planning to add new toilet/shower/sink downstairs. I have one existing on the 2nd floor and right under I'd like to add the new one.
The new one is on the concrete slab, so no basement underneath which makes the work more difficult.
The iron cast pipe goes along the wall and I'm planning to cut it and replace it with PVC all the way up to the existing toilet, plus I will add the new toilet to it.
My question is, since the second toilet is going to be on the concrete slab, is this going to work if it's on the same level as the connection will be? Or does the connection needs to be below the toilet drain. If so, how much below it needs to be so the flushing and draining works properly. Thanks
Do I really have to do the 2nd option and cut out the concrete or 1st option would be ok if I use saniflo, pump. Do I still need to tilt the drain down from sink and shower if the pump used?