Just wondering what people's experiences of MJ M15 Empire Ale yeast are?
Used it a few times in the past and, being a medium-attenuating yeast, it always finishes a bit high. But just bottled a Porter and FG was 1025 (OG1051). So my expected 5% beer has turned out a measly 3.4% with a yeast attenuation figure of 51%: that's the lowest-ever by a long way, in 197 brews.
So I'm wondering what went wrong? The brew was under temp control, and in the FV 20 days, and definately seems finished. Grain bill was loosely based on Fullers London Porter, so 14% Brown Malt in addition to 10% Crystal: could this be the culprit? I have brewed with this grain bill before using different yeasts and got FGs of 1016 and 1012, so I don't think this is the problem, but it's the only brew I use Brown Malt in and am unfamiliar with it.
The only other thing I can think of is that the yeast is too old. Have thrown the packet now, it was stored in the fridge but I think it was one of the older ones in my stash.
Used it a few times in the past and, being a medium-attenuating yeast, it always finishes a bit high. But just bottled a Porter and FG was 1025 (OG1051). So my expected 5% beer has turned out a measly 3.4% with a yeast attenuation figure of 51%: that's the lowest-ever by a long way, in 197 brews.
So I'm wondering what went wrong? The brew was under temp control, and in the FV 20 days, and definately seems finished. Grain bill was loosely based on Fullers London Porter, so 14% Brown Malt in addition to 10% Crystal: could this be the culprit? I have brewed with this grain bill before using different yeasts and got FGs of 1016 and 1012, so I don't think this is the problem, but it's the only brew I use Brown Malt in and am unfamiliar with it.
The only other thing I can think of is that the yeast is too old. Have thrown the packet now, it was stored in the fridge but I think it was one of the older ones in my stash.