I have used a Co2 hop extract of Marinka and Lublin. Our supplier imported pellets and extract from Poland. I found it best used for bittering as it didn't impart the aromatic properties that pellets or whole leaf would. So i would avoid using it on a hop forward beer, like a pale or an IPA.
We used about 20-60 grams for a bittering addition on a 10bbl system, depending on the beer style. It did the job, and it did not go bad, or take up much space.
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