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.

Aquacadabra acts as credit broker/intermediary and not as a lender.

Klarna's credit products are provided by Klarna Bank AB, which is authorised and regulated by the Swedish Financial Services Authority, with limited supervision by the Financial Conduct Authority. More information can be found here.

Newpay finance options are provided through Deko’s platform by NewDay. P.D. Aquatics Ltd, t/a Aquacadabra is an Introducer Appointed Representative of Pay4Later Ltd, t/a Deko, which is authorised and regulated by the Financial Conduct Authority (ref no 728646) and is a credit broker, not a lender. NewDay Ltd is authorised and regulated by the Financial Conduct Authority (ref no 690292) and is authorised by the Financial Conduct Authority under the Payment Services Regulations 2017 for the provision of payment services (ref no 555318). More information can be found by clicking the newpay option above, or in the Newpay FAQs.

We really want you to be happy with the product that you've received. If however, when the goods arrive they're not what you want, then no problem - we have a 60 day no quibble return guarantee. Just let us know that you're going to return the item(s) by contacting us(stating your Order Number) and complete the returns packing slip that will have been included with your delivery. This will help us to quickly identify the item that you have returned (unopened and unused) - and we'll put a refund through for you.