Honeywell Eye saline 1 gallon Saline eyewash Solution can be used directly from the container to refill the eyewash station without mixing or measuring. Ready to use solution is preserved, buffered, pH-balanced and is ideal for use with the Porta Stream I, II, III. The station must be cleaned to remove contamination from the station walls before refilling the solution. 30 months of shelf life when unopened/6 months once opened from date of manufacture.