2 1/2 gallon batches and yeast - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > 2 1/2 gallon batches and yeast

Thread Tools
Old 10-20-2009, 11:06 PM   #1
Jul 2009
Posts: 502
Liked 50 Times on 38 Posts

I'm about to brew up a few 2 1/2 gallon batches and was wondering if using one whole pack (be it a smackpack or a white labs liquid vile) is too much yeast for this batch size or would it be fine? Also, If i were to brew 2 small batches this size and share a pack of yeast between them would that be enough yeast?

Reply With Quote
Old 10-21-2009, 12:39 AM   #2
PintOfBitter's Avatar
Feb 2007
Posts: 1,154
Liked 11 Times on 10 Posts

Most 5 gallon beers really need more than a smack pack or vial of yeast. You'd be doing yourself a favor to use a whole one in 2.5 gallons. If you share a pack, you'll still get beer, but I've found that pitching lots of yeast is one of the best things you can do to assure a healthy fermentation and a good beer.

Maybe you can use these Grain, Hops, Yeast Reference Charts

Reply With Quote
Old 10-21-2009, 12:45 AM   #3
Feb 2008
Montreal, Canada
Posts: 102
Liked 2 Times on 2 Posts

It's not too much yeast for 2.5 gallon batch. Some people pitch twice the recommended amount of yeast in their brew. I do it.

And after one batch, you could reuse the yeast cake.

Reply With Quote
Old 10-21-2009, 01:07 AM   #4
sp1365's Avatar
Jul 2009
Marengo, IL
Posts: 479

I do 2.5 gallons and use 1 vial/smack pack per batch. Works great.

Reply With Quote
Old 10-21-2009, 01:47 AM   #5
Jul 2009
Posts: 67
Liked 1 Times on 1 Posts

Check this link out... It will tell you how much yeast to pitch based on the viability of your smack pack. http://www.mrmalty.com/calc/calc.html

I brew 2.5 gallon batches and was surprised to learn that sometimes, one smack pack isn't enough...

Reply With Quote
Old 10-21-2009, 02:41 AM   #6
mikeysab's Avatar
Aug 2009
staten island
Posts: 4,505
Liked 547 Times on 416 Posts

Doesn't it depend on your SG, and what kind of beer or cider you 're making? I just put together a cider with a SG of 1.090 and used a packet of Red Star Montrachet. I'm thinking it may not have been enough, and this is a 2.5 gallon batch. The way i understood yeast and sugar is that the more sugar you have, the more yeast you need to attenuate it down. A 1.040 beer wouldn't need as much yeast as a 1.090, or maybe not necessarily NEED it, but be able to use it. I brewed a 1.100 belgian quad, used a smack pack that I made a starter out of, and pitched a WLP500, just to be safe. It's been 25 hours, and the things been going crazy. blowing off kreusen, and bubbling up like a machine gun. I added the extra yeast because I raised the SG and didn't want to get stuck with a batch of beer that wasn't fully fermented. I'm only on my 4th batch of beer and first of cider, so maybe I'm not so well informed on the activity of yeast, but this is how I thought it worked

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Kegging 3 gallon batches in 5 gallon kegs? qvantamon Bottling/Kegging 3 02-14-2010 11:31 PM
Yeast Starter For 10 Gallon Batches Airlock_Sniffer Fermentation & Yeast 4 10-31-2009 11:44 AM
Minimum burner BTU - 10 gallon batches in 15.5 gallon keggle schneemann Equipment/Sanitation 21 10-27-2009 04:01 PM
5, or 10 gallon rubbermaid circular for 5 gallon batches becksbolero2 All Grain & Partial Mash Brewing 19 08-26-2009 03:27 AM
Yeast for 10 gallon batches RockfordWhite General Techniques 5 04-24-2008 05:05 PM

Forum Jump