Fluval U Series Internal Filter

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Fluval U Series Internal Filter

Fluval U Series Internal Filter

Fluval U Underwater Filter provides complete and efficient 3-stage filtration, including BioMax biological filtering, to create superior aquarium water quality.

The U Filter includes practical and versatile features, making it ideal for application in fresh, marine and reptile environments.

The filter provides the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The adjustable 3-way flow control feature lets you position the water flow output to meet your specific needs. The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deepwater agitation.

The filter also has a convenient flip-top lid that allows quick and easy access to the filter cartridge for maintenance or replacement. The filter can be installed vertically against the aquarium wall to create currents or customized flow patterns; it can be placed horizontally in shallow water tanks; or it can be used to create decorative features such as waterfalls.

Fluval U filter offers the perfect solutions for aquarium set ups when external filtration is not possible

Key Features

  • Adjustable 3 way flow
  • Flip top designed for easy maintenance
  • Versatile, adjustable positioning
  • For fresh and saltwater aquariums
  • Integrated Spray Bar setting provides a gentle, even flow for planted aquariums
  • Intuitive impeller cleaning
  • Improved filter media cartridge which can hold a large amount of debris plus new Fluval U Clean & Clear cartridge available serperately
  • Sleek, modern design and packaging
  • "plain English" instruction manual


Fluval® U1 Underwater Filter, for aquariums up 55 L (15 U.S. gal.)
Fluval® U2 Underwater Filter, for aquariums from 45 to 110 L (12 to 30 U.S. gal.)
Fluval® U3 Underwater Filter, for aquariums from 90 to 150 L (24 to 40 U.S. gal.). Fluval® U4 Underwater Filter, for aquariums from 130 to 240 L (34 to 65 U.S. gal.)

Product Highlights
  • This product comes with a 3-year warranty.

Delivery costs for your order will be calculated during the checkout process using your designated delivery address and chosen delivery method. You will only pay one delivery charge for your order and this will be calculated on your entire basket after you have entered your delivery address. If for any reason your products are not deliverable to your chosen delivery address, the checkout will inform you of this before your order is submitted.

Our chosen couriers are DPD and Royal Mail. If an order is dispatched directly from a manufacturer then you may have a different courier delivering your order. Full tracking details for all orders sent by DPD will be provided when your order is shipped. You can choose ‘Express Courier’ to receive this service on any standard order. Any order sent from our suppliers, or with DPD will only be delivered Monday - Friday.

All stated delivery times begin from the moment your order is accepted which is when your order is shipped from our warehouse our suppliers. An order confirmation email is not the acceptance of an order by us.

A signature is required for all orders sent via DPD, at which point the responsibility for all consignments passes to you. If you have specified another recipient (who is not you) for delivery purposes, then you accept that evidence of a signature by the said recipient (or another appointed person) at your delivery address is evidence of delivery and fulfilment by DPD and this accepts the transfer of responsibility to yourself.  

We do not ship orders internationally.

To see a full list of our delivery charges and to read our terms and conditions, click here.

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