Solids Control Equipment - Mud Cleaners
Design and operating principles can be found in suppliers literature. Mud cleaners consist of a desilter mounted over a fine mesh screen of 150‑240 mesh. The desilter underflow is treated mechanically by the fine 150-240 mesh screen which allows the liquid phase and any barites present to pass back into the circulating tank while the drilled solids above 75 microns (for 200 mesh screen) are removed.
It is clear from this statement that any drilled solids of particle size less than 75 microns will also be returned to the mud . . .