Don't buy the twin pack. Buy the single.
First off, let me start by saying this is a great product. I'll keep using it. My only issue, is that the company thought it was a good idea to use 1 case for 2 bottles of solutions. This was a cost cutting measure that results in poor cleaning and longevity by the time the second bottle is needed. I strongly suggest against buying the twin pack. Buy the single. You can see the metallic layer faded away at the end of 1 bottle. Now I'm stuck with a extra bottle of solution that I cant even use for regular eye wash.
Rating: 2 stars