What is Sterile Water? Definition: Purified water that has been distilled and sterilized to remove all contaminants, including microbes. Characteristics: What is Bacteriostatic Water? Definition: Sterile water containing a bacteriostatic agent (typically 0.9% benzyl alcohol) to inhibit bacterial growth. Characteristics: Key Differences Preservative: Usage: Indications: Shelf Life After Opening: Safety Considerations