All commercial solvent-extraction plants in the SX-EW circuit produce the formation of crud. Crud is a solid-stabilised emulsion which most commonly accumulates at the aqueous/organic interface in the settlers of solvent-extraction stages. It is caused by a variety of substances entering the SX circuit, ranging from wind-blown dust, entrained solids from the leaching, impurities in the plant solutions, and even insects attracted by the lights in the solvent-extraction plant. While a thin layer of crud at the aqueous/organic interface can aid coalescence of fine droplets, excess crud can interfere with phase separation and severely reduce the efficiency of the settlers. The 3 phase decanter centrifuges are used as state of technology to treat the crud. This paper should indicate the latest control characteristic to process cleanest organic back to the settlers and indicate the payback time for the investment of this advanced technology.