The citizens of Pilsen were no longer satisfied with their top-fermented Oberhefenbier. They publicly emptied several casks of beer in order to draw attention to its low quality and short storage life. It was decided to build a new brewery capable of producing a bottom-fermented beer with a longer storage life. At the time, this was termed a Bavarian beer, since bottom-fermentation first became popular in Bavaria and spread from there. The climate in Bohemia is similar to that in Bavaria and made it possible to store ice in winter and cool the fermentation tanks down to 39°-48°F (4°-9°C) around the year, which is necessary for bottom-fermentation.