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You're not going to like the answer, but the way to properly fix this for good is to break up the concrete, cut out and replace the damaged section of pipe. There are a variety of ways you could break this up. A sledge hammer, a hammer and chisel, a SDS drill with a chisel bit, or a larger chisel like a Brute. If you have a ton of time on your hands, you ...


Assuming there is no toilet above, all the waste going through these pipes should be water only (maybe a bit of hair in the sink). If so, you may be able to plug the leak with a solid rod that fits the hole. The water should run easily around it. You need to figure out if there is one hole in the pipe or two (did you punch through upstairs? Even if not, ...

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