[a.browning]

I run felt filter socks on my reef. Keeps water clarity perfect, reduces nutrients and detritus, and keeps reactors free of clogs and debris. I also have my GFO output going through a sock. Even after rinsing well, you'd be surprised how much dust/fines will make it into the system. Maybe I'm just being paranoid, but that sock collects a lot of GFO dust.