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