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Where is Deionized Water (DI Water) Used?
Last Updated: 05/23/2016

Where is DI water used?

Deionized (Dl) water is an essential ingredient in hundreds of applications, including medical, laboratory processes, pharmaceuticals, cosmetics, electronics manufacturing, food processing, plating, countless industrial processes, and even the spot-free rinse water at the local car wash. Typically, it serves as an ultra-pure ingredient, a "perfect" cleaning solvent, or as the foundation of a process water recovery/reuse strategy.

Processes Deionized water meeting Water For Injection (WFI) standards of purity is used as the basis for saline and other solutions to be injected into the body during medical procedures. Its bacteria-free and mineral-free purity assures the quality and stability of the solution as other ingredients are added to it. DI laboratory water is also used to clean instruments and lab equipment and to perform tissue cell culture, blood fractionation, and other lab procedures.

Pharmaceutical Water/Neutraceutical
Water Deionized water in the pharmaceutical industry is used for preparing culture media, for making up aqueous solutions, and for washing containers and apparatus. It is also used as a raw material, ingredient, and solvent in the processing, formulation, and manufacture of pharmaceutical and neutraceutical products, active pharmaceutical ingredients (APIs) and intermediates, compendial articles, and analytical reagents.

Microelectronics/Semiconductor Manufacturing
In semiconductor manufacturing, deionized water's properties for absorbing minerals, enhancing detergents and residue-free drying make it useful for rinsing and cleaning semiconductor wafers. It is also used in wet etching, bacterial testing and many other processes throughout the fabrication facility.

Deionized water is commonly used to top up lead-acid batteries, cooling systems and for other applications.

Deionized water is often used as an ingredient to add purity, stability and performance in many hair care, skin care, body care, baby care, sun care and makeup products, where it is sometimes referred to as "aqua" on product ingredient labels.

Energy Research
Because of its high relative dielectric constant, deionized water is used as a high voltage dielectric in many pulsed power applications for energy research, such as the Sandia National Laboratories Z Pulsed Power Facility.

Car Wash
When used as a rinse after washing cars, windows, and similar applications, deionized spot-free rinse water dries without leaving spots caused by dissolved solutes, eliminating post-wash wipedowns.

Food and Beverage Processing
Deionized water is used as both an ingredient and a process element in food and beverage processing. As an ingredient, it offers stability, purity and sanitation. As a process element, it is used for effective sanitation.

Water In industrial plants, DI water facilitates water and wastewater recycling; adds efficiency and life extension to boiler and steam processes, and is a key element in industrial commercial water softening.

Boiler Water Treatment
Equipment Deionized water is used to pretreat boiler feed water to reduce scaling and energy use and to control deposition, carryover and corrosion in the boiler system. As such, DI water is an essential element in boiler water recycling.

Cooling Towers
Deionized water can pretreat cooling tower make-up water to reduce scaling and energy use in power plants, petroleum refineries, petrochemical plants, natural gas processing plants, food processing plants, semiconductor plants, and other industrial facilities.

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