Irish Moss?

[tayclem]

What is it exactly? And what does it do for my batch?

I've poked around quite a bit, trying to find an answer, but I can't ever find anything that really explains it.

 

[Beernik]

It's a red algae that grows on ocean rocks.

It has a negative surface charge when dissolved in your wort and binds with positive surface charged proteins in the boil. This will help eliminate chill haze in your beer.

 

[plumber_bob]

I was gonna say it helps your beer clear better. But Beernik said it better!

pb

 

[unionrdr]

It, like Whirlfloc, contains carrageenan that makes the dissolved proteins clump together & settle out when added late in the boil, leaving clearer beer later.