AquaMaxx Fr-s Internal GFO Carbon and Biopellet Filter Media Reactor with Sicce Pump Footprint: 3.4" x 3.2" Chamber Diameter: 2.4" Height: 10" Maximum Capacity: 0.25L (250mL), Pump(included): SICCE MICRA Using GFO: up to 50 gallons, Using Activate Carbon: up to 35 gallons,Using BioPellets: up to 20 gallons