Grain Efficiency

[Stu]

I made a stout last weekend which I didn't read the instructions properly, so I effectively ended up with a brew that's around half what was expected.

However, a couple of things.

Firstly, efficiency. Speaking to a professional brewer, he was explaining that stouts are generally fairly low on efficiency. The particular recipe I used, he said to expect around 60%. I only got 55%.

In terms of amounts, here's what I did.

Started with around 22 litres of strike water. Warmed it to 68c and mashed for 90 minutes. Plenty of stirring with a paddle and recirculating.
Then took 7 litres of sparge water, heated it and rinsed the grains. Left for about 15 minutes, then a half-decent squeeze to dry and get some of the liquid out.

Ended with around 26 litres going into the 90 minute boil. Ended with around 23 litres.

I think I'm doing something wrong to try getting efficiency better. I don't want to do a super long mash - I really don't want it getting bitter.

 

[Appleton Brews]

Can you post your recipe please. I made a stout recently and although the brew house efficiency was a bit low at 73% rather than my average of 75% the yeast attenuation was 67% rather than 79% giving me ABV 3.9% rather than 4.5%. I have also had stouts with low efficiency. The problem is the dark malts which have no fermentable sugars. In future I’m going to add the dark malts at mash out and add more pale malt to get the required OG.

 

[Stu]

Can you post your recipe please. I made a stout recently and although the brew house efficiency was a bit low at 73% rather than my average of 75% the yeast attenuation was 67% rather than 79% giving me ABV 3.9% rather than 4.5%. I have also had stouts with low efficiency. The problem is the dark malts which have no fermentable sugars. In future I’m going to add the dark malts at mash out and add more pale malt to get the required OG.

https://www.brewersfriend.com/homebrew/recipe/view/1523053/something-something-stout

 

[Larse]

Since I started adding rice hulls (5%) to my mash, the efficiency has shot up. Made a stout - there's a thread about how it finished a bit high - not unlike what @Appleton Brews encountered, but I calculated the efficiency at 90% working backwards from the OG. I had to liquor back to match the target OG, so my fermenter volume was 27L, should have been 23L.

 

[Appleton Brews]

https://www.brewersfriend.com/homebrew/recipe/view/1523053/something-something-stout

Wow just adding the black, chocolate and roasted barley that’s 21% which is huge, I’m not surprised the efficiency is low.

 

[Clint]

My efficiency was quite low on all accounts until I changed the bazooka filter in the mash tun for a copper manifold type. I also kept my sparge water temp constant and slowed the sparge down and put a perforated tin foil sheet on top of the mash.

 

[The Baron]

There is enough Diastatic power it shows approx 40 with a minimum of 30 required but from a personal point of view it is way too much dark malts the Black patent at that level may be well acrid and bitter, if using black patent for colouring I only add it for the last 10 minutes of a mash for that reason and 500g is well more than I have ever used.
I would certainly tone them down and as suggested add some of them late in the mash so as not to be as overpowering

 

[Manxnorton]

My efficiency was quite low on all accounts until I changed the bazooka filter in the mash tun for a copper manifold type. I also kept my sparge water temp constant and slowed the sparge down and put a perforated tin foil sheet on top of the mash.

hallow m8,
hope thing good at your end pal.
Yeah i faffed on with the sparge water an my reading went higher.
take care.
Bri

 

[Stu]

Thanks all. I'm going to have another go at it this weekend (using the original recipe).
Point taken about the black. I'll dial it back a bit.

I've thought about rice hulls before. Every time I've gone to use them, TMM are sold out.