Cast iron in basement floor

i am having some drain problems. i have had the roto-rooter guy out a few years ago and cleaned out about 15 feet of cast iron pipe in the concrete basement floor. it worked for a while. now its plugged again

how big of a deal is cast iron in the floor? does it rot away? does the concrete now form the pipe? how do i replace if needed?

Cast Iron is not a forever pipe. At some point it will need to be relined or replaced. Replacement would require wet sawing the concrete. Terry Love