What process do deionizers use to purify water?

Deionizers purify water primarily through the process of ionic removal. This method specifically targets the charged particles, or ions, present in the water. Deionization typically involves the use of ion-exchange resins that swap unwanted ions, such as calcium, magnesium, and sodium, with hydrogen and hydroxide ions. When water passes through these resins, the undesirable ions are effectively removed, resulting in deionized water that is free from most dissolved minerals and impurities.

Other processes mentioned in the choices are less effective for the purpose of deionization. For instance, oxidation involves the chemical alteration of substances but does not specifically target ion removal. Filtration generally removes particulate matter rather than dissolved ions, and adsorption pertains to the adhesion of molecules to a surface, which does not directly remove ions from the water. Thus, ionic removal is the most accurate method to describe the deionization process, emphasizing its effectiveness at purifying water by dealing specifically with ionic contaminants.