What type of water has metal ions and impurities removed?

Deionized water is specifically treated to remove metal ions and impurities using a process that typically involves ion exchange. In this process, positively charged ions, such as calcium, magnesium, and sodium, as well as negatively charged ions like chloride and sulfate, are exchanged for hydrogen and hydroxide ions. This results in water that is much purer than regular tap or spring water, making it ideal for various applications where the presence of metal ions or other impurities could affect the outcome or performance, such as in hair and beauty treatments.

In contrast, tap water often contains various minerals and impurities, depending on the source and the treatment processes it undergoes. Spring water, sourced from natural springs, can contain minerals as well, which may contribute to its taste and characteristics but does not guarantee the removal of metal ions. Distilled water is produced through the boiling and condensation process to eliminate most impurities, including minerals and some metals, but it may not be as effective as deionized water when it comes to ion removal specifically. Thus, deionized water is the best choice when the goal is to have water free from metal ions and impurities.