What is Deionized Water?

Deionized water, sometimes known as DI water, is also known as demineralized water, or DM water. It is water that has had (the majority of) its ions removed. Ions are atoms or molecules that have either more electrons than protons (a negative ion) or fewer electrons than protons (a positive ion) (called a cation).

Ions from the natural environment, pipes, and other sources abound in ordinary tap water. Sodium (Na), calcium (Ca), iron (Fe), and copper are common examples (Cu). Deionization eliminates these mineral ions and is a crucial step in water purification for a variety of uses. 

Cations (Removed by Cation Resins)              Anions (Removed by Anion Resins)
Calcium (Ca++)                                                    Chlorides (Cl-)
Magnesium (Mg++)                                            Sulfates (SO4--)
Iron (Fe+++)                                                          Nitrates (NO3-)
Manganese (Mn++)                                             Carbonates (CO3--)
Sodium (Na+)                                                        Silica (SiO2-)
Hydrogen (H+)                                                      Hydroxyl (OH-)


Although both are forms of cleaned water, deionized water is not the same as distilled water. While the deionization process removes mineral ions to generate high purity water, it does not significantly remove uncharged organic molecules. Whereas the distillation process boils water and then condenses the vapor, leaving behind both solid, mineral and organic impurities. 

What is the process of ion exchange? 

Deionized water (demineralized water or "DI Water") is created using ion exchange resins. These resins are little plastic beads made up of organic polymer chains with charged functional groups incorporated into them. Each functional group is either positively or negatively charged.

Because cation resin possesses a negative functional group, it attracts positively charged ions. Cation resins are classified into two types: weak acid cation (WAC) and strong acid cation (SAC) (SAC). 

The weak acid cation resin is mostly utilized in de-alkalization and other special applications. As a result, we will concentrate on explaining the role of strong acid cation resins in the production of deionized water:

Cation resin is regenerated using hydrochloric acid to yield deionized water (HCl). Because hydrogen (H+) is positively charged, it binds to the negatively charged cation resin bead. Sodium hydroxide is used to renew the anion resin (NaOH). The negatively charged hydroxyl (OH-) binds to the positively charged anion resin bead.   

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Where Can You Get Deionized Water?

There are numerous stores that sell deionized water for various purposes. It is frequently used to fill smoothing irons since it leaves less scaling and is popular for a variety of automotive applications.

As a result, deionized water is frequently available on the shelves of DIY stores and automotive equipment retailers. It is also widely accessible through a number of well-known internet merchants.

Is Deionised Water Safe to Drink?
People frequently inquire whether it is okay to consume deionized water. While deionized water is not harmful, there are several reasons why you should only drink tiny amounts of it and never use it as your primary source of drinking water.

​Regular tap water contains several minerals that are beneficial to our health. Most of them, including calcium and magnesium, which are important elements in our meals, are removed during the deionization process. Furthermore, using DI water for cooking will result in a mineral loss in the cooked food, which is undesirable. It should also be emphasized that deionizing non-potable water will not make it safe.