The ingredient with a dozen names, Deionized Water
Deionized water is also known as DI water, DIW or de-ionized water. It is also synonymous with demineralized water or DM water. These different names all refer to water that has had almost all of its mineral ions removed. For example, cations like sodium, calcium, iron, and copper, and anions such as chloride and sulfate are virtually absent in DI water.