Carbon Filter Falcon 250mm 1420m3/h Carbon Filter Falcon 250mm 1420m3/h. Falcon filters contain 100% Australian Rc-4/8 activated carbon, extracted exclusively from the Collie Basin mines in Western Australia. This is the oldest, purest, and lightest carbon available, and is the top grade of Collie carbon, used exclusively in this filter. Maximum flow (m³/h): 1420 Mouth diameter (mm): 250 Length (mm): 600 Weight (kg): 9.5