Star San is 50%.
Only 35% more to go!
Actually -- it just dawned on me -- does acid last for years on the shelf? I keep it in my basement where the temp is a pretty steady 65F.
You might try Dudadiesel. They're relatively cheap with tons of food and/or photo grade chemicals and some of the best plate chiller pricing I've seen. Plus since it's in alabama you can feel all outlawish.
http://www.dudadiesel.com/search.php?query=phosphoric
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