Cederroth Eye Wash neutralizes the pH of the eye. In other words, it neutralizes splashes of alkalis and acids and provides faster relief than a standard sodium chloride solution. The effect is generally stronger for alkalis than for acids. The shelf life is 4.5 years. If you have an accident involving calcium-containing substances (such as cement, concrete, or lime), you can safely rinse with Cederroth Eye Wash because it is 100% phosphate-free. This ensures that the eye is rinsed as effectively as possible.