Juan - Like others have said…CI that is aged will scale on the interior. There is more than I typically see on a line in Seattle (Not much older than 110 years on the left coast), but all sorts of variables can play into things. Usually you will see it on the bottom, but that piece was hanging tough like a stalactite.
I will usually call it out - there is nothing that can be done with chemicals. Plumbers and rooters have some different concepts they will use (hydro jet, chain grinders, etc…) I usually tell them to use the line until they have an issue and then at that point, the plumber has to clear the scale and blockage. There is a risk of pipe damage with any “fix”, so in my eyes, hold off until you have a real issue. Also, as others stated, since it is super typical, it could be that they get another 20 years with no issues too.
If you do a youtube search on “de-scale cast iron” you will see some video footage posted of treatments.
Now - Get after it. It will pay for itself fairly quickly if you let agents know you have it. Also, be sure to ask clients if they have an interest in a sewer scope as well. It provides peace of mind in conjunction with the top notch inspection report you should be doing too. Do not undercut your market on pricing! Maybe offer all agents you like working with to have the first one for them done at half price to get them comfortable with the whole concept. Be creative and you will find yourself doing a scope on 3-4 per week easily.
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