The second brew done with “Bubble Logger SPINDEL”, and this brew is done with only 10-15% headspace. As the Classic Munich Yeast is rather explosive I was aware this needed to be done with blow-out, and as such first real brew using blow-out. OG = 1056, and FG is 1012.
The tube I use is rather hard and I keep is as short as possible, secondly ensuring no bends. I am not sure if the placement of the blow-out jar on top of my friends “SS Brewtech 25L” fermenter might had made some of the sound go though jar into fermenter, or all sound is coming from tube. I guess both.