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Thats correct.

My intent was to keep all of the 3" pipe (everything in the slab) at 1/4"/ft then using the 1/16th fittings to drop down to sewer elevation over a short distance instead of an 8ft run of 3" pipe dropping 12", thus giving it a 1.5"/ft slope. The reducer you see is actually acting as an increaser...

Thanks for the info! He did mention a few times he doesn't know much about plumbing and that plumbers would know "how to fix it" if I just asked them. Doesn't inspire me with much confidence that he knows how drains are supposed to work...

The 3" line has 1/4"/ft along the entire length except for the one section between the two 1/16th bends. I do have a cleanout located at the other side of the building ( highest and furthest point in the drain system) as well as two more cleanouts along the 65ft run of sewer line to the house.

I building a one bed on bath unit in my backyard and connecting the sewer line from the unit back to my house. I had an inspector(young guy, pretty new at his job) come by today and fail me for the ~12" drop from the plumbing elevation under the slab on grade to transition to the elevation of...