Fluidized GFO and Carbon Filter Media Reactor - Standard

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Discontinued by Bulk Reef Supply
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AquaMaxx Fluidized Media Reactors are multi-purpose aquarium water filters specially designed for use in marine and reef aquaria. Insert your media of choice to help eliminate organic pollutants, odors, discolorations and algae fuels.

Fluidized reactors, also commonly referred to as phosphate or media reactors, are one of the easiest and most effective ways to use filter media in a saltwater aquarium system. These versatile filters are capable of running several different types of filter media, from activated carbon and granular ferrous oxide to resin and nitrate-reducing media.

The up-flow design of AquaMaxx Fluidized Media Reactors helps to keep filter media suspended and evenly dispersed to provide maximum contact time between your aquarium water and the media inside the reactor. Water is introduced into the bottom of the filter and then gravity pushes it upward through the media and back out into your tank.

AquaMaxx Fluidized Media Reactors  are computer designed, precision-cut and made of polished A-class acrylic. All AquaMaxx media reactors are rigorously tested in saltwater environments to ensure reliability, efficiency and affordability.

AquaMaxx Fluidized Media Reactors require a small pump/powerhead and tubing (sold separately) to push water through the reactor. You can plumb the reactor using 1/2" or 3/4" flexible vinyl tubing. Using a ball valve is highly recommended because it will allow you to regulate the flow rate. Since different types of media have different flow rate requirements, be sure to reference the manufacturer’s suggested flow rate for the media you intend to use (it’s usually listed in the product description and/or on the product label).

An optional hang-on adaptor (sold separately) is available for additional mounting configurations. 


  • Reactor Footprint: 5.5" x 5.5"
  • Chamber Diameter: 3.94"
  • Reactor Height: 11.5"
  • Chamber Capacity: 0.43 gallons (1.6L) ~6.7 Cups
  • Using GFO: up to 250 gallons
  • Using Activated Carbon: up to 150 gallons
  • Inlet/Outlet: 1/2" or 3/4" hose barb


Accessories & Replacement Parts


AquaMaxx Fluidized Media Reactors are available in four sizes: XS, Standard, XL and XXL

More Information
UPC 895976001454
Manuals Instruction Manual
Reactor Placement External, Hang On
Total Volume 1.6L
Media Capacity 6 Cups / 1419mL, 7 Cups / 1656mL
Pump Included No
Optional Mounts Hang On/Bracket
Output Size 0.5" (1/2 in.), 0.75" (3/4 in.)
Tubing Inside Diameter 1/2 in. (0.5" / 12.7mm), 3/4 in. (0.75" / 19.05mm)
Skimmer Type External
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Product Questions

Hi, what size pipe thread does this use? I may need to use straight barbs instead of the 90s it comes with. Thank you!
Question by: Justin on Feb 25, 2024, 1:27 AM
Hey there,
Thank you for reaching out to us. From our testing it would be 3/4 " threads. Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Mar 1, 2024, 11:37 AM
What size pump is recommended for running GFO on a 110 gal. aquarium? (150 gal. including the sump)
Question by: Randy Phillips on Jan 1, 2022, 12:31 PM
The standard GFO reactor comes with both 1/2" and 3/4" barb fittings allowing for multiple pump options. You can use either an AC pump with an added valve, or a controllable DC pump to operate the reactor. You would want to be able to adjust the flow for the GFO to tumble slightly but not swirl through the reactor chamber. For an AC pump, look at a Sicce Syncra 1.5 or 2.0 and for a DC pump look at Current USA 6008 DC flow pump or a Reef Octopus S-2 controllable pump that may suit your needs. You can also connect these to the main return line if the return pump is sufficient and you install a manifold under the tank with a valve for the reactor to be adjusted. All the pumps above come with barb fittings that should work with one of the supplied barbs with the reactor.
Answer by: Rick Pucciarella (BRS Staff) on Feb 4, 2022, 12:26 PM