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Heh. Ran into this a couple weeks ago. Clients did the same thing. They bought the auger and did all that and still called me. Turned out the builder ran the vent pipe up a foot in the island and then back downhill. In addition to clogging their drain, they clogged their vent by backing food and water uphill and then down into the basement again. Would have worked forever that way had they not backed it up like that. We capped the vent and installed a Studor.
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