Magic Plumbing San Francisco

I have a home that had tree root problems and was causing the sewer to back up. We snaked out the sewer line and it runs ok. The problem is the sludge and gray water that has built up. It has clogged up in a pipe that has branched off the main. Snaking does not help because it sludgy. A plumber suggested jetting out the entire system with a power jet, but this is too expensive for me and might crack my clay tile. Is there any other alternative to fix this problem? ( e.i a chemical or some other

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