So, we have Orangeburg pipe (or another similar brand) leading from cast iron to the septic tank. Well...some smart person put some concrete for a post on part of it many years ago. Guess what that did (several holes and it's now oval instead of round)? I can't believe we didn't find it sooner. But now...we need to replace it. Rather than try to fix the orangeburg we're replacing it, although what we have dug so far, aside from the part squashed by the concrete appeared to be in pretty good shape still. Considering it's PAST it's 50 year lifespan, I guess that's pretty good-although I wish it had reached and exceeded it about 5 or 6 years ago so someone else could have this fun task (even though we bought the place 2 years ago it was vacant for a few years, so I am thinking about 5-6 year would have landed it while it was still occupied). Oh well. Now. The problem. How the heck was this stuff attached to cast iron? We aren't ready to replace that YET and don't really want to break it. That goes into the slab, and is the waste line from the only bathroom. Since this fun all decided to occur this year, our Old House is rented, so we can't just go live there again for a little while we complete this task. We might be able to use the neighbor's house at some point later when we do the cast iron, at least for bathroom, but that's hopefully for later. Also...anyone know how many 90 degree angles can be in a main sewer line? If we have to redo the cast iron there'd be at least one, and possibly two, if we can leave it there would be three-this dang pipe was run UNDER a room and we'd rather not leave it that way, because we have to break up a bunch of concrete if we do. Then we need to figure out how to connect PVC to the cast iron. I am leary of that cast iron, I know it's probably 60 years old and brittle.... Another weird problem...it seems the inlet on the septic tank is LOWER than the outlet. Does this seem right? The tank isn't crooked (like it settled funny), it just looks like it was made this way. I'm not home to see this, I'm getting a play by play from DH on this. I guess there are tubes in the tank leading to the outlet which is near the top of the tank. Could this actually be backwards (like someone put the in at the out and the out at the in)?? Are there maybe two outlet pipes, one lower than the other (kind of like the extra drains in sinks and tubs to catch over flow in case of a clog in the main drain)? This is very likely the original 1950's tank, considering the orangeburg ran to this tank. This is our first foray into the world of septic, previously the Old House had sewer service and someone had already replaced the main line out with PVC before we bought it (although the stack...ugh..is still cast iron).