Quote:
Originally Posted by retromike
Found the access panel and am able to look up in there and i do see the vent going up the wall to roof, so I guess its vented. Not sure what I can do from here. I dont know if maybe I can install a vent in the line under the sink like the 2 sinks have? Its really frustrating as the tank is right there and I cant see why it backs up. Tried again blowing it all out with pressure to no avail.
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Perhaps you can verify the grey tank is properly vented. First check the vent on the roof for an obstruction like a bees nest. You could then measure the distance within the vent pipe itself or you could add water to the vent pipe to see if it accumulates, which it should not.
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