De-ionized water undergoes extensive filtering and distillation using resin and carbon filters to exclude ions from other impurities. This technique produces de-ionized water, which is considered much purer than standard distilled water. It is commonly used in skin care products. This ensures the product's safety and effectiveness while also offering skin benefits such as improved absorption, pH balance, consistency, and longevity.

Deionized water is often used for scientific investigations, inverter batteries, and industrial cleaning. Its purity prevents soap residue and scale build-up, making it ideal for processes requiring high cleaning standards. De-ionized water is a non-toxic option for cleaning parts and equipment, making it popular in the food sector. Furthermore, the absence of hard minerals prevents corrosion of metals such as copper pipes.