Wow, over 20 yrs in the trade- never heard that word. Sounds cancerousI had to look up 'tuberculation':huh: and basically is means build up on the inside of the pipes, from what I can tell.
It could be tuberculation but the only way I believe you could tell for sure if it is tuberculation is to cut the pipe open and look. It would be a real PITA though.
What type of piping do you have?
Tks w-man, I have a new favorite word to sling around.