Two Little Fishies

PhosBan Reactor 550

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The PhosBan Reactor 550 is designed to push water upwards from the bottom and through the media. This forces an even distribution of water throughout the media and prevents channeling from occurring. The PhosBan 550 media reactor has a low profile and built-in hanging bracket making it ideal for "hang on the back" applications. The Phosban reactor can house your favorite filtration media.

  • Great for HOB applications
  • Includes ball valve
  • Works great with Phosban Media
  • Requires feed pump


The PhosBan 150 can be mounted under the aquarium or hung on the back of the aquarium. It comes with barb hose fittings for 1/2" tubing and a 1/2" barbed ball valve included for flow control. The Phosban 550 is compatible with any pump that uses 1/2" tubing and a flow rate between 100 and 250gph.



  • Max Media Capacity -750 grams
  • Inlet Tube - 1/2"
  • Outlet Tube - 1/2"
  • Max Flow Rate - 250 gph
  • Dimensions - 15.125" H x 4.5" W x 6.5" L
  • Distance required behind tank for HOB application - 5" min


What's Included?

  • Phosban 550 body
  • Phosban 550 Lid
  • Ratchet Clip
  • Soft 90 Elbow (3x)
  • Sponges (2x)
  • Dispersion Plate (2x)
  • Ball Valve
  • Short Pipe Adapter
  • 9" Tube


Note: Media, Tubing, and pump sold separately.

More Information
UPC 748172425503
Reactor Placement Hang On, In Sump
Media Capacity 3 Cups / 710mL
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Product Questions

Would you recommend using this reactor for biopellets?
Question by: Matt on Nov 14, 2015, 1:12 PM
Hey there Matt,
Great question. This is not optimal for bio-pellets as it is not designed for the best tumbling of bio-pellets and there may be some clogs. Ideally selecting a bio-pellet designed reactor with the correct chamber to spin and tumble the media. Feel free to let us know if you have any further questions!
Answer by: Connor on Nov 16, 2015, 5:36 PM
what are the dimentions of this reactor? and the 150 model please? Thank you!!!
Question by: Tyler on Sep 2, 2014, 6:53 AM
Hi Tyler,

The PhosBan Reactor 550 is 15 1/8 inches tall and 4 1/4 inches in diameter.

I hope this helps!
Have a great day :)
Answer by: Bulk Reef Supply on Sep 2, 2014, 6:53 AM
What is the purpose of a reactor
Question by: Michael on Mar 23, 2014, 8:19 AM
Hi Michael,
GFO has a tendency to clump and harden into a rock unless it is agitated. A GFO reactor like the phosban (or other GFO reactors like ours, octopus, vertex, etc) are fluidized bed reactors. The water travels up through the bottom of the reactor and upwards through the media, which causes it to tumble lightly and prevents it from clumping.
Answer by: Bulk Reef Supply on Mar 23, 2014, 8:19 AM