I'm replacing a toilet's wax ring in my 1960 US home. With the toilet removed, I noticed ugly-looking bumps on the inside of the cast iron drain pipe:

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Here's a closer, more tasty look:

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Aside from any coprophobia, are these bumps a sign of a serious problem (e.g. corrosion)?

  • You could make the effort and polish them out with a dremel...
    – Solar Mike
    Dec 26 '19 at 23:01
  • Thanks, but I'm assuming the problem extends further than what I can see. Dec 26 '19 at 23:22
  • I'm more concerned with the standing water in horizontal waste water pipe. Looks like it is close to 1/2 full.
    – Charles
    Dec 26 '19 at 23:24
  • @SolarMike, you can't polish a turd ... lol ... i just could not help myself
    – jsotola
    Dec 26 '19 at 23:57
  • @Charles It isn't half full, but it is standing water. As with the rest of my concerns, fixing it would mean replacing a substantial amount of very inaccessible pipe. So, time for the better part of valor... Dec 27 '19 at 1:01

Yes, that is signs of corrosion and in another 100-150 years, that will result in leaks in that pipe...

  • And it may last longer because sometimes the surface iron will corrode until a graphite flake is reached , then corrosion stops ( aka . graphitic corrosion ). Dec 26 '19 at 23:03

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