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).
Worked great. Everyone loved the beer.
Worked like I hoped.
Just as described
I have always used Irish Moss and I believe it does the job.
Works as advertised. Great price, great quality, and all shipped with the amazing Northern Brewer speed!