The four production lines of this phosphoric acid plant underwent major revamps during 1992 - 2004. For example, a new Swenson phosphoric acid concentration unit was installed in 2004. The dihydrate process offers several advantages: it can be used with all types of phosphates (sedimentary or igneous); phosphate can be supplied in slurry form (wet grinding); it is easy to control the water balance (recycle pond water, reduction/elimination of liquid effluents); it achieves good P2O5 yield.