Demineralized water, also known as deionized water (DI water), is water
that has had most or all of its mineral ions, such as calcium, magnesium,
sodium, and chloride, removed. This process is typically achieved through
ion-exchange resins that swap the mineral ions with hydrogen and
hydroxide ions, resulting in highly purified water. Demineralized water is
commonly used in laboratories, pharmaceuticals, industrial processes
(like cooling systems and steam generation), and electronics manufacturing,
where the presence of minerals could interfere with operations or damage
equipment. It is also used in sensitive cleaning applications where mineral
residues must be avoided.