... combined into a huge rotary surface,skimming throughly. Circulation Toothed Harrow Mud Cleaner is generally used in sewage pretreament the ... ),the minium clearance can be 1mm.Features:no bars,small toothed rakes combined into a huge rotary surface,skimming throughly.Supply ... the complete set,and will be convinient for installation. Circulation Toothed Harrow Mud Cleaner