Opened the wall, first cut made above the U shape/S shape pipe and cleared it. Second cut made after the above and before the fall off and removed it- about 3 feet worth- it was full of sludge. Rented a snake at HD, tried all the blades and was only able to penetrate the next section about a foot before running into a blockage that felt and sounded "soft" through plenty of sludge. Snaked it for about 2 hours of and on. Wouldn't budge. Went under the house and it appears only a fall off and connection to the main waste line left. All the other drains- sink, toilets, tubs, garbage disposal, outside in the yard lines and the roof vent have been snaked and/or are working fine. WHAT NOW?? What can I use to clear this line??

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second cut made after the above and before the fall off and removed it- about 3 feet worth- it was full of sludge

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Where was the second cut made and what's a "fall off"?

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tried all the blades and was only able to penetrate the next section about a foot before running into a blockage that felt and sounded "soft" through plenty of sludge. Snaked it for about 2 hours of and on. Wouldn't budge

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Where are you snaking from? What cutter tip did you use? As you loosened the sludge did you flush the sludge away with hot water? The best way to clear a blockage is with a snake. Go back and try again. Good luck, Tom