Foam Control (FermCap S)

Foam Control (FermCap S)

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No more boil overs, no more blow-off tubes. Once you’ve used Foam Control you’ll never brew without it again!

Foam control does just what its name suggests--it reduces foam production during  the hot-break portion of the boil, and it reduces the amount of krausen developed during fermentation.
Also known as FermCap S, Foam Control does not affect the head on your finished beer. In fact, it can actually increase the head by retaining head-forming compounds that would have been blown off during fermentation. It will settle-out of your beer before bottling or kegging as it is actually absorbed onto the surface of the yeast cells and filter media. 
Add two drops per gallon at start of fermentation. Comes in an eye dropper bottle for easy use. 1 oz is good for about 50 x 5-gallon batches of beer. Also available in bulk 1 gallon size.
Note: Keeps best when stored in the refrigerator.
Like Foam Control (FermCap S)? Then you will love CellarScience® Foam Axe - Anti Foaming Agent!
Community Q&A

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Browse 3 questions Browse 3 questions and 9 answers
Why did you choose this?
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only option
DJ C on Feb 10, 2023
To control krausen blowout
JamesC814366206 on Jan 24, 2023
only option
DJ C on Feb 10, 2023
control boil overs for starters and kettle
Rob S on Feb 9, 2023
To control krausen blowout
JamesC814366206 on Jan 24, 2023
Heard a lot of positive things
Ricky R on Jan 20, 2023
To ensure my fermentors don't bubble over
Jacob M on Jan 12, 2023
To keep yeast starters from foaming over top of flask
Chris L on Jan 3, 2023
antifoaming works great
Michael Z on Nov 11, 2022
Works great
Mark Gardner on Nov 1, 2022
Because it's awesome
Brandon M on Oct 29, 2022
Heard this works great to control foam
Damon S on Oct 29, 2022
control boil overs
Marshall C on Sep 29, 2022
Control the foam while fermenting in the 6 gal Torpedo Keg
Joseph on Jul 19, 2022
Just to get up to free shipping minimum. Always need more...
Valued C on Jun 29, 2022
Decided I might need it for newly ordered Air Still.
fieldho on Apr 22, 2022
for yeast starter
jim f on Apr 4, 2022
Essential to prevent boil overs
Daniel M on Feb 15, 2022
To control the foaming during boil
Kyle W on Feb 2, 2022
Great for fermenting in a corny keg.
Tysen Bibb on Feb 1, 2022
stopping boil overs
Joshua B on Jan 28, 2022
To avoid boilovers when makin yeast starter wort or durong a full batch as well. Works like a charm.
Fernando S on Jan 22, 2022
I'll be using this product for yeast starters
Eric E on Nov 6, 2021
kevin m on Aug 23, 2021
To ferment in keg
Jurrien K on Apr 21, 2021
prevent yeast starter boil over
Antonio Martinez on Mar 16, 2021
It has saved me from many boil overs in the past and I have brewed to many batches without it.
Tristan B on Feb 2, 2021
If you enjoy boilovers then you don't need this
John c on Jan 15, 2021
to reduce krausen in fermenter
Valued C on Jan 8, 2021
yeast starters, brew kettle, carboy
Curtis S on Dec 8, 2020
Less boil overs
Dyami Q on Dec 3, 2020
Running low.
Jose L C on Dec 2, 2020
Looking to control fermentation over-flow / blowoff
John S on Nov 13, 2020
Does a great job mitigating boilovers in small brew kettles.
Nathan R on Sep 15, 2020
To control krausen
Ryland Matthews on Sep 7, 2020
watched video and researched
Gary on Aug 27, 2020
First two batches blew out my airlocks.
Jeff Harrington on Aug 5, 2020
To avoid blowouts when brewing.
Noah A on Jul 22, 2020
No blowoff!
David Roberts on Jul 15, 2020
it works
Steven D on Jul 9, 2020
Trying to control foam in yeast starters
William H B on Jun 16, 2020
Wouldn't brew without it. Prevents messy boil-overs
Kevin Dyson on Jun 16, 2020
Makes life sooooo much easier
Bradley Korte on Jun 8, 2020
to control foam on boil
try pressure fermenting in a keg
SHANE on May 29, 2020
Never tried it before, but saw it in a video and thought I'd give it a try
Scott S on May 14, 2020
Ever had a boil over? Me too. No longer with this stuff.
Eric O on May 9, 2020
Have used this for years and it's a gr8 product mentioned it to many people and they are surprised to hear about it.
Steve Van P on May 5, 2020
I don't like blowing things up with foam
Geoffrey N on Apr 29, 2020
Need it for boil overs
Ethan W on Apr 28, 2020
Best foam control I’ve had, I currently have the 5 star foam control and prefer fermcap
Chris Mylroie on Apr 18, 2020
Minimize head space while fermenting in keg
Eric N J on Apr 15, 2020
control boil overs for starters and kettle
Rob S on Feb 9, 2023
Heard a lot of positive things
Ricky R on Jan 20, 2023
It says to add at start of fermentation. Does this mean at yeast pitch or when signs of fermentation start?
John Cuthbertson on Nov 28, 2023
BEST ANSWER: From searching the internet, "Fermcap S™ settle out in the yeast sediment when fermentation ends. Use ¼ to ½ teaspoon per 5 gallon batch of beer, adding right before you add the yeast. Preserved with sodium metabisulphite. This 4 fluid oz. bottle is good for many batches and should be stored in a cool place, and shaken before each use to unify the emulsion.
So if I add this in pre-boil do I need to add a second dose when I fill the fermenter?
tony ashdown on Mar 3, 2023
BEST ANSWER: I only used Foam control during the boil to keep it from bubbling over. There is a fine balance between a vigorous boil and having the boil bubble over out of the pot and make a big mess. This is where I used Foam Control was during the boil to keep it from foaming over.

I suppose you could use Foam Control during fermentation as well if you are afraid of your fermenter bubbling over and blowing out your air locks or blow off tubes. I have had that happen a few times and it is also a big mess. I have never used Foam Control for this, but it seems like a good idea. I will try it next time it looks like my fermenters might bubble over.
How does this work to prevent boil over in an air still?
MICHAEL MALOY on Apr 17, 2023

4.8 / 5.0
32 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
No boil-overs...
Two drops per gallon of wort being boiled and you'll avoid a sticky mess if you turn away from your kettle for three seconds. I had six drops in three gallons of wort and my "boil" looked like a slow, rolling simmer. Very impressive stuff...
June 22, 2023
Rated 5 out of 5
Wish I would have had this years ago
February 3, 2023
1 year ago
Rated 5 out of 5
It works
This works great at reducing foam during hot break and boil. I haven't had a boil over since I started using this. Thumbs up!!
January 5, 2023
1 year ago
Rated 5 out of 5
Love the stuff
Been using it for years. Always in my brewing toolbox.
September 12, 2022
1 year ago
Rated 5 out of 5
Works and didn't have a negative effect on the beer
August 16, 2022
1 year ago
Rated 5 out of 5
Keeps foam down to avoid boil over in my air still when using a wash of mash that may be prone to overboil.
May 15, 2022
over 2 years ago
Rated 5 out of 5
Definitely works!
Wow! I used this on my last 3 boils. Just a few drops made the foam disappear. No more boil overs. Impressed.
April 30, 2022
over 2 years ago
Rated 5 out of 5
Won't Brew Without It
Does what it says it does. Cheap. Effective. Results are often immediate. Has prevented many a boil over. Every brewer should give this a try at least once.
March 1, 2022
over 2 years ago
Rated 5 out of 5
A must for anything over 1.050.
February 9, 2022
over 4 years ago
Rated 3 out of 5
It works, but I can't open the bottle
The one ounce bottle is nearly impossible to open. It hurts my fingers terribly and after ten minutes I usually give up. When I've gotten it open it does work well.
November 26, 2021
over 3 years ago