Cederroth Eye Wash works to neutralize the eye’s pH value, i.e. it has a neutralizing effect on alkali or acid splashes, giving a quicker result than a normal sodium chloride solution. The effect is generally stronger on alkalis than acids. Shelf life of 4.5 years. If you have an accident with a substance that contains calcium (for example, cement, concrete or lime), you can safely rinse with Cederroth Eye Wash as it is 100% phosphate-free. This ensures that the eye is rinsed as effectively as possible.