off flavours

[dean fisher]

hi all, last three batches have all had a grassy/ musty off flavour all different recipes and the only thing in common is the sack of glad fields malt that I brought. I still have the gains in the sack and am storing them in the spare room so I wouldn't think they would be getting damp or anything like that. I have found a few spots of mould in my brew room would this be causing it?

[Barry]

I'd be extremely doubtful that this is a result of mould spots on the wall. How exactly would they get into your fermenter to affect the fermenting beer?

I'd look more at your vessels – the things in direct contact. What do you ferment in? What do you dispense from?

[Mark Weusten]

I agree with Barry. In my fermenting room a bottle started leaking in a cardboard box and mould started as a result. I found some black spots growing on the inside thread of the fermenter lid but didnt get in and cause any off flavours in the beer.