I lve in an older RV resort.A tenant said our maint. guy said his "blocked" sewer main was "collapsed" and of charcoal construction? I've been a Plumbers' Apprentice in Indiana for 5 years,Building Maintenace Engineer(10 years)Apartments,etc.,maintenance15 years.NEVER heard of "Charcoal"pipe or derivatives!Our Park was built appx. 1938.I've searched web and saw a few sites mentioning Cast Iron sewer lines with coal tar? Was that what this "guy" was referring to? Thanks Da' Muff'n Monster
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