Demineralization Processes to remove minerals from water, usually the term is restricted to ion exchange processes. Demineralization depends on the advanced water treatment method known as the ion exchange process. The ion exchange process has several different kinds of use but one of its most common utilizations works by utilizing cations in the water that are purified and swapped with hydrogen by sending the water through strong acid cation (SAC) resins in the form of hydrogen. As the resins sees diminishing returns as a result of exhausting, the user must replenish it with regenerate chemicals (sometimes acid) to prevent the water from not being treated to its required quality. When the resin becomes exhausted to the extent that the water is not treated to the required quality.