Clogged Kitchen Drain From Hades
My friend recently bought a house, and the kitchen sink acts up. After running the water for about 2 minutes at full strength, it began backing up. When I say "back up", I mean so bad that it takes 5 minutes just for the water to leave the sink. She's tried plungers, drain cleaners, you name it. No other drains act up, just that one.
Thinking it might be the garbage disposal, I took it off, and checked it out, but it looked fine. I also cleaned some gook out of the S-trap.
So rather than re-attach the pipes, since I had easy access to the drain, I took the water line off the faucet, put it right into the drain pipe, and turned on the water pressure. Sure enough, it ran for about 30 seconds before clogging. Five minutes later, with a flashlight, I could still see the water level; it had only dropped about 8 inches.
I went and got my 25' auger. After 8 attempts, I did clean some gook, but it still not unclogging!
Underneath the sink in the cellar is a 90deg elbow, 18" of 1.5" diameter copper pipe, followed by a 45 degree elbow, followed by 6' of the same pipe, which then goes into the main waste line. The 6' segment is soldered at both ends.
While I am familiar with basic soldering of pipes, I'd like to know if I can just remove the 6' section, and what I'm getting into here. Can I handle this, or is this a job for a pro? Any ideas what this could be?
Thanks in advance!