bwall
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I have just finished a basement shower with a tile floor over a concrete pan mud base. I'm getting sewer odor back up. This wasn't happening at first if at all minorly. It's been done and used for a month or so now until the bad smell. I think that I screwed up in putting in a trap (its crooked or just an 90 elbow down to another 90 elbow going parrallel to the ground into the drain pipe. I can't see any water in the drain. I can feel the air blowing up out of drain now, didn't notice or have smell before. Is the trap the problem here. I broke out the floor in the basement down to the line put in by the builder for the shower and tied into that when I started this. I have shoved a rag in the drain now and presently don't run the shower. I'm afraid that I have to break up the pan floor and go back down and reset better p-trap. Any advice or ideas on this?