Anonymous wrote:Out of curiosity, what makes you think your drains need replacing? There are 300 year old cast iron drains still in service in Europe. Now galvanized pipes…that's a different story.
There is considerable wet spots with rust buildup on the underside of the drain pipe: crusting/bubbling and pointing along good portion of the run. I see drip residues on the plastic beneath and it's worsening. Additionally there is significant rust and the pipe appears thinned, like it's corroding, in spite of tar coating. I do not see obvious cracks, and haven't looked with a mirror. It's an old pipe: if this is what it looks on the outside, I can imagine how gunked up it looks on the inside, especially bottom half. Preventive maintenance before a nasty leak.