Clarifying decanters are used to separate solids out of a suspension to obtain a virtually solids-free, clarified liquid. Dewatering decanters ensure maximum concentration of the solids to get them as dry as possible. Separating decanters separate two chemically immiscible liquids with simultaneous separation of the solids. Classifying decanters split the solids mixture of the suspension into a fine (small particles) and a coarse (large particles) fraction. Extraction decanters mix a liquid containing a solid or extract with a liquid agent which contains the solids or liquid after mixing. Finally, there is the possibility of integrating a co-current, counter-current or dilution washing system in the decanter for washing the suspended solids.