Grind your nibs. I just started a Mead with nibs.. and used about 2 oz (maybe 1.75, so hard to tell after you taste sample a bit etc).... No I don't know how much for your porter I think I've seen recomended in another nibs discussion about 6 to 8 oz for a 5 gallon batch....
Anyhow if you don't grind them, they will 1 float, and 2 they don't look like they will disolve I've not tried powder
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