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Well, I tried measuring the water depth in the P-trap, and nothing I did (slowly pouring water down the drain versus running the shower) seemed to make a difference. The P-trap was staying full...

Whenever soldering near a shower valve is unavoidable, I use a cold wet rag draped over the valve and pipe to keep it cool.

Good thinking, HJ. That should tell me if velocity through the riser is my issue. I'll check it out.

Thanks

Thanks, Randy.

Anybody else have any creative solutions that don't involve tearing out my newly installed shower?

So are there any other options aside from tearing up the shower floor and slab in order to install a primer or make an S-trap with vent?

At this point I'm leaning towards putting some mesh screen...

Yup. Mine is pretty loud too - the trickling sound seems to echo and resonate in the drain riser.

I thought I kept the P-trap deep per Terry's suggestion to avoid an S-trap?

Oh my. With my slab foundation and newly tiled shower, I'm not sure this trap primer is something I want to undertake....

Ok, so I got my bathroom all finished up. But if the shower goes unused for a few days, the house begins to smell funky and it seems to be worse in the shower stall.

I'm pretty confident that my...

Thanks guys. Probably saved me from creating a problematic shower drain.

This may belong in the shower/bath forum. Feel free to move it if necessary.

I'm remodeling my master bath. As part of this bath redo, the shower will be expanded. The old shower floor is...