We had some more discussion on how to improve foam stability. So, what can basically be done to get a better head retention? The key influence factors on foam are different fractions of nitrogen, isohumulones, alcohol and some other things. The former described method to bring in post-fermentation iso hops couldn't be done as extra equipment needs to be bought and no space is left for new equipment. The brewerey is stuffed until the roof. The coagulable nitrogen which precipitates, or should precpitate, during boiling is a bonus factor for the foam.