Hydrocyclone is a device to separate solids and liquids. In oilfield industry, it devided into desander hydrocyclone and desilter hydrocyclone. 
Desander cone is 10” cone, it can separate 45 ~76 microns solids, desilter cone is 4” usually, it can separate 20~45 microns. Solids control equipments manufacturers use different desander cone and desilter cone qty to assembly different treating capacity mud cleaner. So mud cleaner is composed of desander cone, desilter cone and shale shaker.