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What is DI Water and Other Terms?

If you've heard a lot of deionization but aren't sure what all of the terms mean, the water professionals at US Water Systems can help. Read on for answers to your questions about DI water, as well as clear definitions of many related terms.

What Is DI Water?

DI water is high purity water that has had its ionized minerals removed. The water passes through two types of ion-exchange resin, which swap out positively and negatively charged particles for hydrogen (H+) and hydroxyl (OH-) ions. Since nearly all water contaminants are ions (once the organic matter is removed), this leaves creates high purity water that can be used for manufacturing, pharmaceutical industries, laboratories, and other commercial purposes.

What Is DI?

"DI" is an abbreviation for "deionization." The basic deionization definition is simply the process by which ions – charged particles – are removed from water. Typically, this process involves using an ion-exchange media that attracts the charged mineral ions and replaces them with ions that, when combined, make water.

What Is Deionization Used For?

Deionized water is used in many industrial processes, as well as in the cosmetic and pharmaceutical industries and for laboratory purposes. High purity water is important for these industries because it does not contain the contaminants that could negatively impact the manufacturing processes. DI water is typically only used for commercial purposes.

What Is Demineralization?

In water treatment terms, demineralization is the remove of all minerals from water. This process is similar to DI, but the demineralized water and deionized water meanings are slightly different. While deionized water is demineralized, some demineralized water may contain NaCl, or salt.

What Is Conductivity and How Is It Related to DI?

Conductivity is the ratio of the electric current density to the electric field in a material. Some materials, such as the metals copper, silver, gold, and platinum, have very high conductivities but other materials, such as plastic, may have a very low conductivity. Seawater contains a large quantity of dissolved salts therefore, has a high conductivity. Deionized water, which has had the minerals removed, has a low conductivity.

What Is a Dialysate Meter?

A dialysate meter verifies the total concentration of ionized salts in dialysate solutions used in hemodialysis or kidney equipment.

What Is HCl?

HCl stands for hydrochloric acid, which is typically used to regenerate cation resins used in deionization systems.

What Is NaOH?

NaOH stands for sodium hydroxide, a strong base. It's highly alkaline and highly corrosive. Sodium hydroxide is typically used to regenerate the anion resins used in DI water systems.

What Is a Resin Bed?

A resin bed is a layer of treatment media in a tank or cartridge. This material is usually made up of small organic polymer beads that have been specially treated to make them attractive to negatively charged particles (anion resins) or positively charged particles (cation resins). A DI system may contain a bed of anion resin, cation resin, or a mixed bed containing both types.

What Is a Cation Resin?

Cation resin is a type of organic polymer media that has been chemically treated to attract positively charged ions.

What Is a Anion Resin?

Anion resin is the opposite of cation resin. It's treated to attract and remove negatively charged ions from water.

What Is a Mixed Bed Resin?

Mixed bed resin is a mixture of anion and cation resins. When water passes through the media, both negative and positive ions are attracted to the different resin types and removed from the water. Mixed resin bed deionizers are considered the most effective DI systems.

What Is Scale?

Scale is the buildup of mineral salts on surfaces exposed to water. Scale can build up on boilers, cooling towers, water pipes, and many other containers. Deionization can be used to remove mineral salts from water, dramatically reducing scale or eliminating it completely.

What are Total Dissolved Solids?

Total dissolved solids (TDS) is a measurement of all organic and inorganic substances dissolved in a solution. In water treatment, high levels of TDS indicate water that is not very pure.

Some information complements of Myron L