SD-200 Desander is a mud purification and treatment machine developed for wall mud used in construction, bridge pile foundation engineering, underground tunnel shield engineering and non excavation engineering construction. It can effectively control the slurry quality of construction mud, separate solid-liquid particles in mud, improve the pore forming rate of pile foundation, reduce the amount of bentonite and reduce the cost of slurry making. It can realize the environmental transport and slurry discharge of mud waste and meet the requirements of environmental protection construction.