Is there a process to reline a 3/4" copper water line with 90's?

[Steven Rivers]

I have a customer with a high-efficiency condensing furnace in the attic above a third floor, installed with a copper line for the furnace condensate discharge. This line should have been run in PVC, as the combustion exhaust condensate is acidic. The line is inaccessible and buried in the walls or ceilings until it exits on the first-floor exterior. It is not blocked but has developed leaks, likely on the bottom of a horizontal run. The home is a townhouse with a very restrictive HOA that will not allow any alteration to the exterior of the building.

I believe there is a process that does not use a liner but may involve forcing an epoxy or resin product through the line to reline the tubing interior. The product is then blown out with compressed air before it is set. Does anyone know about this?

 

[Twowaxhack]

Install a condensate filter and pump then pump it to a pvc stack in the attic or wherever