Dimensions: 40 L x 40 W x 42 H cm (15.75 L x 15.75 W x 16.5 H\") Main Points: Multi-stage filter pumps out 700 gallons (2650 L) of water per hour Smart Pump™ – advanced microchip technology continuously monitors and optimizes pump performance Self-starting – just add water, plug in and Smart Pump™ will take over. Trapped air auto-evacuated every 12 hours to ensure maximum efficiency Easy water changes eliminate need to lift heavy buckets. Simply attach hosing to output (Kit sold separately) and Smart Pump™ does the rest Removable, stackable media baskets eliminate water bypass and hold a total of 1 gallon (3.9 L) of media All filter media included – mechanical, chemical and biological Aqua-Stop valves with leak-proof Click-Fit attachment system Valves positioned at convenient 45-degree angle for easy installation and rotation Anti-clog, telescopic strainer ensures continuous water flow Multi-Directional Output nozzles can be fully adjusted to create customized water flows Utility Valve with drain hose for easy maintenance and flushing of canister Rubberized feet help ensure quiet operation Compact 16.5″ tall design – easily fits under most aquariums Made in Italy For use in freshwater and saltwater aquariums Comparison: MODEL FX4 FX6 Item # A214 A219 Barcode 15561102148 15561102193 Aquarium Capacity 250 US Gal 400 US Gal (1,000 L) (1,500 L) Pump Output 700 US Gal/h 925 US Gal/h (2,650 L/h) (3,500 l/h) Mechanical Area 217 in2 325.5 in2 (foam) (1,400 cm2) (2,100 cm2) Biological Volume 1 US Gal 1.5 US Gal (3.91 L) (5.9 L) Filtration Volume 3.7 US Gal 5.28 US Gal (14 L) (20 L) Filter Circulation 450 US Gal/h 563 US Gal/h (1,700 L/h) (2,130 L/h) Head height 6.9ft 10.8ft (max.) (2.1 m) (3.3 m) Wattage 30 W 43 W (120V/60Hz) Wattage 30 W 41 W (230-240V/50Hz) Dimensions 15.75 x 15.75 x 16.5\" 15.75 x 15.75 x 20.8\" (L x W x H) (40 x 40 x 42 cm) (40 x 40 x 53 cm) Included: Ribber hosing Rim connectors, clips and suction cups Intake stem Output nozzle Lid fasteners Filter canister Utility valve and hosing Drain cap Pump unit (motor) and power cord Rubbert feet Media baskets 1/2 media baskets Filter lid and accessories Warranty: 3 Year Limited Warranty