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Large contaminants based on size only
Coarse screens
Large contaminates based on size and density
High density cleaner
Medium to small contaminants based on size and stiffness
Fine screens
Heavy small to really small contaminants based on density
Forward centrifugal cleaner
Small to very small light contaminants based on density
Reverse centrifugal cleaner
Ink based on size
Washing
Ink based on hydrophobicity
Flotation