Home Brew Forums > Home Brewing Beer > General Techniques > Irish Moss to Clear Up Beer
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Old 08-04-2012, 09:20 AM   #1
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Default Irish Moss to Clear Up Beer

I I used Irish Moss for the first time on my last batch and Jesus was that beer clear. I poured it an couldn't believe how clear it was! I could see straight through the glass and see the dishes sitting in the cupboard in the other side! If you haven't already, I suggest you use it for enhanced clarity in beer. My other batches have been decent clarity wise but the I M really helps.


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Old 08-04-2012, 11:35 AM   #2
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It is a very popular fining agent. Doesn't produce near as much cold break trub as whirlfloc. How much I'M did you use for what batch size?


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Old 08-04-2012, 12:55 PM   #3
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I used 1 teaspoon, maybe a little bit over a teaspoon for a 5 gallon. Do you use a different amount?
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Old 08-04-2012, 01:03 PM   #4
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Can you add Irish moss during fermentation or can you only add during the boil? Never used before.
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Old 08-04-2012, 01:45 PM   #5
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I typically use two big pinches of flakes for five gallons. I'm likely to stop using whirlfloc soon, as the cold break production is huge (using 1 whole tablet). I have seen the same clarity in both techniques at 21 days of cold keg storage.
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Old 08-04-2012, 01:55 PM   #6
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Quote:
Originally Posted by blarsen71 View Post
Can you add Irish moss during fermentation or can you only add during the boil? Never used before.
Last 15 minutes of the boil.
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Old 08-04-2012, 02:14 PM   #7
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Quote:
Originally Posted by blarsen71 View Post
Can you add Irish moss during fermentation or can you only add during the boil? Never used before.
It only helps with the cold break, so post boil it won't do anything.

I typically add mine in the last 10-15 minutes of the boil. I have had clear beer without it though. I also usually add one teaspoon for my 6.75-7 gallons into primary batches. Obviously, I add more for larger batches.
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Old 08-05-2012, 08:29 AM   #8
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As said above, Irish Moss only works near the end of the boil. If you have a cloudy beer after fermentation, your clarifying options are isinglass and gelatin. Of those two, I've only used gelatin, and I've found it works wonderfully. A quick forum search will provide lots of useful info on that.
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Old 08-05-2012, 08:53 PM   #9
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Aha! I'm glad I found this thread. I used a whirlfloc tablet for the first time in my last beer and I couldn't believe how much trub I had. It was a new recipe so I wasn't sure what was the cause. Wish I would have known this sooner as I just bottled today and ended up siphoning a bunch of trub into my bottling bucket because I had sunk the siphon too low for how much trub I had. Totally sucked because I ended up losing a few bottles because it clogged my bottling wand near the end.
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Old 08-06-2012, 11:26 AM   #10
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Aha! I'm glad I found this thread. I used a whirlfloc tablet for the first time in my last beer and I couldn't believe how much trub I had. It was a new recipe so I wasn't sure what was the cause. Wish I would have known this sooner as I just bottled today and ended up siphoning a bunch of trub into my bottling bucket because I had sunk the siphon too low for how much trub I had. Totally sucked because I ended up losing a few bottles because it clogged my bottling wand near the end.
Invest the 3$ in a racking cane, well worth it.


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