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Location #1 - Sink to Wall Drain Pipe
I removed the P - pipes, it looked pretty clean - smelled bad though.
Location #2 - Vent Pipe Cap - to Septic Tank
I removed the vent pipe cap outside of the house, and used a bladder to flush out the blockage. It flowed might fine but the slow drain persisted.
Location #3 - Wall Drain Pipe to Vent Pipe Cap
I inserted the bladder into wall drain pipe to flush out any blockage between wall drain pipe and the outdoor vent pipe. The flush was smooth, the slow drain persisted.
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I notice that the bladder gripped the inner wall the drain tube and shoot out a small string of high pressure water, I am not sure it really clears the "blockage" - in that 2-3" pipe, or just bored out a 1/8" hole in the blockage to clear that high pressure water squirt?
Fixing it like a toilet
I resorted to my old fashion way of fixing a plugged toilet drain - try the 5-gallon bucket - and let the "gravity" do the push - pushing out the clogs.
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I loaded the kitchen sink with the garbage disposer with tub of water, and covered the adjacent sink drain. I hope that the centrifugal water pressure is pushing through the entire pipe, not just the pushing, making an opening big enough for the 1/8" water jet to pass through.
I cranked up the disposer like a blender, short pauses, and longer pauses, short puses and let it ripped. Somehow it worked. The sound of joy - I could hear a vacuum sucking sound, the water was flowing outward to somewhere.
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Conclusion
The bladder may work well in a really clogged up pipe, I think the hair clogs is a suitable application.
For older, galvanized pipes - the blockage due to rust or reduced inner- rough surface, I think the old snake is still a better tool to use. I wonder if the running "crushed ice" through the drain pipe will create the "scrubbing effect" - and take out residuals in the pipe?
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Photos: 2010 Poland Krakow
Plug: 782SA.blogspot.com
