Sewage Water Treatment Station PAC dosing 3D model is available on CGTrader for $12. Original author: tangulan. Specs: 3815997 polys, 3069714 verts.
FBX (Autodesk FBX, filesize: 120 MB), MAX (Autodesk 3ds Max, filesize: 171 MB), 3DS (3D Studio, filesize: 58.6 MB)