ABSTRACT The Demin Plant produces pure mineral-free water which is used as boiler feed water. One of the units in the Demin Plant is strong acid cation (SAC) to remove cation ions using Dowex HCR-S cation resin. At certain times, this resin will be saturated so that it needs to be regenerated. The effective regeneration of the resin is an important aspect to ensure optimal performance of t…