The final phases of the fermentation process proceeds in lager tanks (114 115 hectolitres) in a cellar. Each tank is equipped with a barometer, a draw-off tape and a manhole. These tanks replaced original wooden casks which were used till 1972. Beer which is pumped into these tanks from the fermentation vats contain yeast that initiate the final phase of fermentation. During this final phase beer gets higher percentage of alcohol, proper taste and bouquet, purity and brightness. Draught beer must stay in the cellar for at least 14 days, lager for at least 50 60 days.