The mighty FX4 Filter is smaller than the powerful FX6 range, yet bridges the gap between the Fluval 406 external filter and FX6 and is suited for aquariums up to 1000 litres.

Key Features Include:

A multi stage filter which can pump out up to 2650 LPH.

Self priming assembly with the smart pump and no danger of air locks as trapped air is evacuated every 12 hours.

No need to move the filter to do water changes as it comes with a outlet fitted to the bottom of the unit.

A continuousley monitered smart pump which uses advanced microchip technology keeps the pump running at optimal power.

Compact stacking filter media compartments which can hold up to 3.9L of media.

Can be used in saltwater or freshwater setups.


This filter comes with everything you need to get it up and running including all the media.

Delivery Information

Fast Free UK Delivery on orders over £60.00.*
Smaller orders under £60.00 are subject to a £4.95 delivery charge. Delivery will typically be made within 2 - 3 working days but may be extended during peak times.

We Can Offer Next Day Delivery for £7.95*
To meet our deadline for this service you must order before 11.00am to ensure delivery for the next working day. This excludes weekends and bank holidays.

*Extra charges or restrictions will apply to certain UK postcodes. These include parts of Scotland, The Highlands, Northern Ireland and offshore Isles. Please note Next Day delivery is not available to these locations. Please click here for a full list of postcode exclusions and contact us today for a personalised quote. 

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