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Irish Moss


SKU# U9006

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A kettle fining derived from seaweed. Add 1 teaspoon per 5 gallons to the last 15 minutes of the boil to enhance cold break (protein coagulation).

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Irish Moss 1 oz.

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  • Irish Moss 1 oz.
Product Details

A kettle fining derived from seaweed. Add 1 teaspoon per 5 gallons to the last 15 minues of the boil to enhance cold break (protein coagulation).

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4.9 / 5.0
15 Reviews
5 Stars
4 Stars
3 Stars
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1 Stars
Irish Moss...
Works as advertised. I use 1 teaspoon in every 5 gallon batch of beer, except my wheats of course...
January 10, 2016
Mandatory in my beers!
I use this at end of boil, and gelatin at kegging and my beers are crystal clear without filtration.
September 14, 2013
Great stuff
This is great stuff for a beer who's style is supposed to be clear. Works well. Do not use on beers that are supposed to be cloudy (ie, wheat).
July 12, 2013
Great way to clear beer
My brew partner and I started using this as a way to make a clearer beer after some of our friends pointed out how cloudy some of our beers were and haven't looked back. Add a bit if this in the last 15 minutes of the boil and you'll have yourself a really nice and clean beer. No funny aftertastes, and it's all natural, which is something we pride ourselves on very much. Highly recommended.
September 20, 2013
You Need This!
It helps keep beer clear. A few times I've been out and you can really tell when bottling. I view this as mandatory these days.
December 26, 2013
Irish Moss
Recently moved from Extract Kit brewing to All Grain brewing (with coolers for mashing and sparging). A teaspoon of Irish moss with 10 to 15 minutes left in the boil seems to help to get clearer beer.
August 7, 2016
works great
I've used it on severa batches, and each one turned out very clear.
August 8, 2013
works well
what can i say it dose what it says and it works well
August 28, 2014
It works
Toss in a couple pinches with 10-15 mins to help drop out more of those silly proteins... works great.
December 10, 2013
Today is the first day I have every used this stuff my beer is drastically more clear they could charge 5 times the price I would still feel it was a bargain and a new must have
February 23, 2014
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Browse 5 questions Browse 5 questions and 14 answers
What would happen if you added too much irish moss?
jonathan d on Apr 11, 2017
BEST ANSWER: There are a lot of variables at play in the taste of a beer. Irish Moss does have a flavor and it is akin to seaweed. Irish Moss should only be added to the boil and with plenty of time (15min) prior to finish.

Too much has the potential for adding an undesirable flavor. That being said: How much flavor would be detectable would depend on how bold the flavors in the beer are.

If you are not satisfied with your fining agent, I would step it up to whirlfloc. http://www.northernbrewer.com/whirlfloc-10-tablet-pack Personally I prefer Irish Moss as I am adding for stabilization and not appearance. I have found whirlfloc to be a bit more effective at producing clarity. Gelatin also seems to do a very complete job of clarifying.
Is this more for the golden beers, pilsners, ales, or can this be used for stouts and porters? I'm just r Ying to get rid of the junk in the bottom of the bottle. Using a secondary next batch. (Only done the 1 gallon thus far) thanks
jack S on Nov 29, 2016
BEST ANSWER: Hi there,
Irish moss can be used in any beer and is used in the last 5 minutes of a boil. It's generally used as a clarifier by helping proteins clump together. Cheers!
I just ordered irish moss (NB) and read something saying not for extract brewing, is it so ?
Dennis S on Mar 27, 2017
BEST ANSWER: It's fine to use it. Extract wort contains the same proteins as all grain wort and that's what the compounds in Irish Moss bind to. Now the question is if it's needed in any case. Opinions vary.
What are the advantages of this product, if any over Whirlfoc?
Lynne R on Oct 9, 2015
BEST ANSWER: I've never used Whirlfloc so I can't speak for how good of a job it does. I've always been satisfied with Irish moss and it's about half the price of Whirlfloc. Lastly, from what I've read, Whirlfloc has carrageenan in it which is a known carcinogen. I try to stay away from items with carrageenan in them (and yes I realize pretty much everything nowadays has some link to cancer).
I see it's 1 tsp per 5 gallons. Is there any measurement if you're just making 1 gallon jugs? (I guess I could say 1/5th tsp but that seems pretty darn small)
Corky G on Apr 10, 2016
BEST ANSWER: You would just scale it down, it would be fine to go with 1/4 tsp. You don't want to overdo it, the 1/4 tsp should work fine. -Mike W, Northern Brewer

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