Chemboys - Deionized Water 5 GallonChemboys Deionized (DI) water has been filtered and treated to remove virtually all ions and contaminants. NO dissolved mineral salts, inorganic materials, and impurities. When working with tap or distilled water, you usually need additives to achieve desired levels for your plants. Using DI water helps you to start with a pure base to build a plants required ecosystem. The Deionization method is considered by many as better than distilled water. This