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Yes the issue has to do with trap distance from drain. The turbulence causes soap suds to bubble out from the overflow.

So I did a bit of experimenting and I believe it might be due to the trap height and the turbulence from the faucet.

That was what the tub had when i purchased the house a few years ago. Would have to buy a new assembly to test that out.

This is what the tub is using. https://www.lowes.com/pd/Keeney-1-5-in-Chrome-Roller-Ball-Drain-with-Plastic-Pipe/3591176

The tub waste is 1.5in. I attached a picture but currently it is 1.5in tub waste to 1.5in p-trap. Then 1.5in to the 1.5in long sweep 90 which feeds into a 1.5in 45 and then into a 2 x 2 x 1.5 wye. From their it is 2in to the 3in main. I don't have a water softener setup at the moment.

So it is a non issue?

- When taking a shower only.

- Yes 1/4-inch per foot from the p-trap to the long sweep 90 and 3/8-inch per foot after the 90 to the main drain.

What were the first issues that required a change? - I went from 1.5in drain to 2in P-trap. - Wye fitting for vent was on its side. Did you have the suds problem with the first configuration? - I did have the suds problem with that first setup. Is the vent after the trap shown in picture 7? -...

Hey guys I am trying to figure out what I did wrong and why soap foaming out of my over flow. Bathtub Drain: 1.5in P-trap: 1.5in Code: 2015 Michigan Residential Code Here are some pictures: First Attempt: Had the same issue here and a few mistakes so ended up redoing it, Second Attempt: