It’s 21:15, about eight or nine hours since pitching, and this Kveik has just taken off in the last hour or so. I’m seeing a growing carpet of foam on top of the wort and have fitted a blow-off bottle, moving the spunding valve away from the likely erupting Krausen.

I’ve set the spunding valve to 10 PSI by dialling it high and filling the blow-off bottle from my CO2 tank, then reconnecting the valve and opening it until the pressure dropped back down to 10. Unfortunately I didn’t de-pressurise the bottle further, and when I reconnected it to the FV a small amount of sanitiser rushed up the dip tube as the vessels equalised. Hopefully that won’t trouble the wort or the yeast too much in this important early stage – oops!!