# Brewing a concentrated wort

### Help Support Homebrew Talk:

#### DustyTheBrewer

##### Well-Known Member
Hey guys,

So let me preface with I've searched and cant seem to find a solid answer to this. If this thread goes well, I'll be adding the info to the wiki.

I have been having an influx of demand for my beer (started military pilot training) and would like to boost my production.

I have a 15.5 gal keg MT and a 15 gal kettle which allow me to do a solid 11 gallon batch (limiting factor being the BK).

I am familiar with the calculations C1V1=C2V2 and know how to do the math. What I am wondering is if I use beersmith to calculate the grain bill for a 15 gallon batch, will I get the OG I am looking for? I fly sparge and wonder if I will extract enough sugar before my boiler fills up. Will my efficiency go way down?

Also, to my knowledge IBUs are linear. So if I use enough hops for a 15 gal batch during the boil for a 10 gal batch, everything will work out, right?

To summarize, will a beersmith recipe for a 15 gal batch:
a) Give me a concentrated enough wort to dilute to 15 gal (from 10 gal)?
b) Give me the IBUs calculated for 15 gal (from 10 gal)?

Thanks in advance. I hope this topic hasnt already been beaten to death.

Dusty

#### dcp27

##### Well-Known Member
a) yes, but most take an efficiency hit when brewing bigger beers. For me, I drop to about 65% from 75%. you can either boil longer to make up for the extra sparge, add extract/sugar, or add more grain to account for the loss.

b) sorta. due the the more concentrated wort, the IBUs will drop a bit. however, you probably won't be able to notice much of the difference.