The Fluval FX4 External Filter is a powerful canister filter suitable for freshwater and marine aquariums up to 1,000 litres. Positioned between the Fluval 406 and the larger FX6, it delivers impressive filtration performance in a compact design. This particular unit has been used previously and is supplied with new impellers fitted for dependable operation.

Key Features

• Suitable for aquariums up to 1,000 litres
• Multi-stage filtration system
• Pumps up to 2,650 litres of water per hour
• Smart Pump™ technology continuously monitors and optimises performance
• Self-starting operation for straightforward setup
• Automatic air evacuation every 12 hours to maintain efficiency
• Removable and stackable media baskets with a combined 3.9-litre media capacity
• Includes mechanical, chemical and biological filter media
• Aqua-Stop valves with leak-resistant Click-Fit attachment system
• 45-degree valve positioning for easier installation and maintenance
• Anti-clog telescopic strainer for consistent water flow
• Adjustable multi-directional output nozzles
• Utility valve for simplified maintenance and canister flushing
• Rubberised feet help reduce vibration and noise
• Compact design fits beneath most aquarium cabinets
• Made in Italy
• Suitable for freshwater and saltwater aquariums

Condition

• Used item with signs of previous use
• New impellers fitted
• Original box not included
• Drainage hose not included
• Drainage cap not included

The Fluval FX4 remains a popular choice for larger aquariums, combining high flow rates with proven multi-stage filtration. Its intelligent pump technology, large media capacity and straightforward maintenance make it a practical solution for maintaining excellent water quality in both freshwater and marine setups.