Unable to creat single shell

Hi everyone, I’m trying to simulate 2 connected sedimentation Tank. I created the Geometry in 3D but when I shell the faces, I get a warning : “Unable to create single shell. Result is a copound of shell”. After that you can not create a solid of that compund of shell. I believe that the shell has to be a single shell to create a solid of it. I even fused the whole Geometry to one shape but it did not work either. Does anyone know how can I get rid of this warning? Here is the .hdf file on google drive Sedimentation_Tank
Thank you very much for your time.

Hello Sandro,
I coulndt use the atmosphere and Face_bottom to create the solids, but I have succesfully created them. I used the Tank_1 and Tank_2 and used the tool repair/suppress holes of geometry and then intersected the different solids to create the final solids that, at least from my understanding, was the objects that you were looking for.
regards.
F.
Sediment_tank.hdf (238,8 KB)

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