The oil phase free of hydratable gums flows to a Centrifugal mixer after heating in a plate heat exchanger, where it is added with phosphoric acid from an acid storage tank by a metering pump. The mixture is further taken to a Centrifugal mixer, where it is added with caustic lye from the lye solution service tank by a metering pump. The caustic solution circuit is completed with a storage tank and recirculation pump. The mixture is then taken to a centrifuge where the non-hydratable gums and soap stock are separated and pumped out of the system by a pump via a soap collecting tank.

Washing:
Oil free of gums and having traces of soapstock is pumped by a pump through a plate heat exchanger, where it is heated by steam. Then it is sent to the Centrifugal mixer to be mixed with water and further centrifuged in a centrifuge for water washing. The washed water is then further sent to the slop oil tank for collection and recovery of escaped neutral oil, which is then taken back to the system by a pump.