Besides using a filter bag to house chemical medias, there aren’t really too many options for administering GFO or Carbon filtration on smaller tanks with smaller filters. AquaFX has made a note of this and bundled up a small water purification canister with the necessary plumbing and parts to turn into a small media reactor with quite the minuscule footprint.
Much in the same vein as the Bluelife USA Resinator, the AquaFX Misty Media Reactor uses small gauge tubing to supply aquarium water to the small type of canister which is generally used inline to prefilter reverse osmosis water. The AquaFX Misty Reactor can be unscrewed to replace your media of choice and it comes with the tubing and quick-disconnect valve to regulate the rate of aquarium water flow-through.
AT just $39 for all the required parts to make a small media reactor the Misty is a great deal not to mention it can be placed inside or outside the aquarium sump for those times when space is at a premium, especially in the case of over-engineered nano aquarium filters. The Misty Media reactor can hold about 1.5 cups of media and is compatible with a wide range of small aquarium powerheads. [AquaFX via Aquanerd]