GFO Reactor

GFO Single Media Reactor

  • Heavy duty all aluminum rust resistant construction. (New)
  • Clear double O’ring high pressure 10″ housing
  • 3/8 fittings and ports throughout to reduce head pressure and provide ample flow rates. (New)
  • Swivel 90 degree fittings on both sides of the unit for easy positioning of the tube. (New)
  • High quality 3/8″ ball valve for precise tuning.

Two Little Fishies Phosban Filter Media Reactor

  • Capacity: Use with up to a maximum of 200 grams (385 ml) of PhosBan, or a media height of 5 inches (13 cm)
  • Aquarium size: One reactor for up to 150 gallons (568 Liters). Multiple reactors may be used for larger aquariums.
  • Recommended flow rate: ca. 20 – 30 gal/hr (75 – 115 l/hr) . Too much flow can grind PhosBan
  • Connection for hoses 1/2 inch (12.7 mm) i.d. The inlet and outlet flexible 90° fittings rotate to suit your installation

GFO is a form of chemical filtration in the reef-keeping hobby today. Chemical filtration, as the name suggests, purifies water by binding up impurities at the molecular level. A GFO reactor helps initiate this process. We’ve rounded up the best we could find online, just for you guys


Sam is the owner and main writer for Fish Tank Bank. He has been keeping fish and building aquariums for over 20 years.