We just filled a 19 litre Cornelius keg until foam started coming from the airlock, but it was mostly sanitiser. Reckon there’s about 18 litres in the 19 litre keg, give or take. The rest went into a 5 litre MJ Mini, stopping again at the foam-in-PRV stage. Maybe 1 litre left in the Fermzilla that went to the fishees.
Forgot to take FG reading so we’ll try to remember when it’s done conditioning in a couple of weeks’ time.