Kasztelan Niepasteryzowane is a unique invention from Carlsberg Polska. The difference is that this beer is not pasteurized (heated) which gives it a completely unique freshness.
But because it is not pasteurized, Kasztelan Niepasteryzowane has a relatively short shelf life of 35 days. However, that means it's always fresh on the shelves straight from the brewery in Siepc in central Poland.