Fluval FX4 External Filter

6 reviews

Building on the mighty FX platform is the all new FX4, a compact little brother to the FX6. Known for its strength and durability, FX6 outputs 3500 L/h in aquariums up to 1500L. Capable of outputting 2650 L/h, the FX4 bridges the gap between the Fluval 406 and the FX6 canister, making it an ideal choice for consumers with aquariums up to 1000L.


  • Fluval FX4 External Filter
    code: A214 In Stock (10+ Available)

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Product Information

Brand new on the market this FX4 makes sure you can expect FX's legendary mix of power and efficiency that lets you spend more time enjoying your aquarium and less time maintaining it.

FX4 Features a Smart Pump capable of 2650 L (700 US Gal) of water per hour with advanced microchip technology that continuously monitors and optimises pump performance

Self-starting - just add water, plug in and Smart Pump™ will take over. Trapped air is auto-evacuated every 12 hours to ensure maximum efficiency. Removable, stackable media baskets eliminate water bypass and hold a total of 3.9 L (1 US Gal) of media which is all included.

Multi-directional output nozzles can be fully adjusted to create customised water flows and its utility Valve with drain hose makes for easy maintenance and flushing of canister.

FX4 is compact measuring 40 cm by 42 cm in height which easily fits under most aquariums. For use in freshwater and saltwater aquariums

GuaranteeAquarium CapacityPump OutputMechanical Area (Foam)Biological VolumeFiltration VolumeFilter CirculationMax Head HeightWattageDimensions
3 Years Limited

1,000 ltrs2,650 lph1,400cm²3.91 ltrs14 ltrs1,700 lph2.1m30wL:40cm x W:40cm x H:42cm


  • Rubber 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
  • Rubber feet
  • Media baskets
  • 1/2 media baskets
  • Filter lid and accessories
  • All filter media included - mechanical, chemical and biological

Latest Customer Reviews

  • Rating
    Date 01/12/2020 00:12am
    Fluval Fluval FX4 External Filter
    Feefo Logo
    I was in desperate need of a new filter, and picked up a new Fluval FX4 for an amazing price and speedy delivery.
    Easy and simply install, and overall a very happy customer.
  • Rating
    Date 04/01/2020 04:01am
    Fluval Fluval FX4 External Filter
    Feefo Logo
    Good price, fast delivery
  • Rating
    Date 07/11/2019 14:11pm
    Fluval Fluval FX4 External Filter
    Feefo Logo
    Fluval FX filters are among the best in terms of build quality and maintenance. The specifications should be taken with a pinch of salt (who would run a filter without media to obtain the specified maximum water flow?). Talking about the media there is too little supplied and it's not the best, consider swapping it for something else.
  • Rating
    Date 05/12/2018 10:12am
    Fluval Fluval FX4 External Filter
    Feefo Logo
    Its a FX4 and its doing what a filter should do.
    Doesn't come with a spray bar which I found a bit disappointing and if you have a deep tank you will need more hose. My tank is 130cm wide x 95cm high sitting on a cabinet housing the filter and I was annoying short of 600mm of hose so its cutting and joining and fuss that shouldn't be.
  • Rating
    Date 26/08/2018 08:08am
    Fluval Fluval FX4 External Filter
    Feefo Logo
    Very pleased with the quality of the Fluval FX4 and hope it will give me years of service
  • Rating
    Date 14/01/2018 22:01pm
    Fluval Fluval FX4 External Filter
    Feefo Logo
    Very good fast service arrived very quick , happy with my new canister filter fluval fx4
  • Rating
    Date 25/07/2017 09:07am
    Fluval Fluval FX4 External Filter
    Feefo Logo
    To early to give full review on product but so far so good. Easy to set up, feels sturdy. Had a bit of an issue with the filter trapping air but this was sorted by reseating the hoses correctly.