Loose GFO or carbon in a media bag works, but a dedicated reactor keeps chemical filtration media properly fluidized for full contact with passing water. The Reef Octopus MF300B and MF800B Complete Media Reactors ship as all-in-one hang-on-back kits, ready to run out of the box.
Why a Fluidized Media Reactor
Chemical filtration media like GFO and activated carbon works best when water flows evenly through the entire media bed rather than channeling around clumped, unfluidized media in a bag — a proper reactor keeps media suspended and in full contact with flow.
Choosing a Size
- MF300B — an all-in-one hang-on-back media filter kit, shipping with the feed pump, hoses, and fittings needed to run right away.
- MF800B — steps up media capacity from the MF300B in the same all-in-one hang-on-back format.
Setup Tips
- Rinse GFO or carbon before loading to remove fine dust that would otherwise cloud the tank.
- Adjust flow to gently tumble media without blasting it against the outlet screen.
- Replace media on a regular schedule rather than waiting for it to fully exhaust.
The Reef Octopus Complete Media Reactor line is available at Marine Concept Supply — order online or pick up at our shop in Wheeling, IL. Shop MF300B or MF800B, and browse more reactors.
