am a little curious about this also i just set up my brs dual reactor and they have an instructional video and it says that carbon should be in a lower flow after my gfo , he goes on to say that carbon works better in " long contact times" and " low flow rate" .........

is this wrong??

this was thie vid:


http://www.youtube.com/watch?v=ODZPFlJLopk

20 to 30 GPH for GFO......seems light.......you would have to dial the MJ1200. Dodown quite a bit.....confusing

I think it all comes down to what reactor and how much media you are using (which is relative to tank size).