Deionized water is water that has had its ions removed through a process called deionization or demineralization. Ions are electrically charged atoms or molecules found in water that have either a net negative or positive charge. The process of deionization involves exposing conventional water to electrically charged resins that will remove salts from water by binding to them. The resulting water is free of impurities and minerals, making it ideal for applications that require precise chemistry, such as lab experiments and manufacturing applications. Deionized water is also used in the medical industry, microelectronics, and as a solvent for the production of various products.

Deionized water is not the same as distilled water, although they are both forms of purified water. While the deionization process produces high purity water by removing mineral ions, it will not significantly remove any uncharged organic molecules. On the other hand, the distillation process boils water and then condenses the vapor, which leaves both solid mineral contaminants and organic contaminants behind.

Is deionized water safe to drink? Deionized water is safe to drink, but its not the best option for three reasons:

• Lack of minerals: Deionized water lacks minerals that are good for you, such as calcium, magnesium, and iron. You can easily take in these minerals from a well-rounded diet, but it doesnt hurt to have them in your water, too.
• Flat taste: Removing minerals also affects the taste of the water, and deionized water doesn’t taste great. The taste difference is hard to describe, but some say deionized water tastes "flat" or "off."
• Remaining contaminants: Deionized water may still have organic compounds, including viruses or bacteria, that can make you sick. This sounds counterintuitive, given that deionized water is thought of as "pure." But "purity" with respect to water means the absence of minerals and other impurities, not necessarily the absence of all contaminants.