I find any carbon that needs a fine bag, the bag just clogs up. My preference now is matrix carbon in a coarse bag. I only run it for a week every couple months anyway.
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A specific granular activated carbon size/shape.It seems relatively easy to profess ignorance in reefing. The above re ROX is a 2 factor case in point: A: I have NO idea what ROX is. B: The answers re ROX are 50/50 in favor of. As my LFS likes to say, ask 3 people the same question, get 4 different answers. What is ROX, bottom line?