Mud Cleaner is the second stage and the third stage solids control equipment which is a combination of Desander, Desilter and underflow shale shaker. Comparing with traditional separate Desander and Desilter, the mud cleaner has a higher cleaning function. The Underflow Screen equals another shale shaker which receives the waste out from the cyclone nozzle for additional processing. So that mud cleaner could recover more valuable drilling mud. Mud cleaner is the ideal device of the second class and the third class solid control to treat the drilling mud.