Fluval U Series Filters

Internal aquarium filters for small to medium tanks

At a glance...
  • Internal filters with a 3-year guarantee for aquariums up to 240l
  • For fresh and saltwater aquariums
  • Adjustable 3-way flow control
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Excellent customer service, ordering was simple, delivery was fast.

What are Fluval U Series Filters?

Fluval U Series Filters provide easy, convenient filtration, and have the capacity to independently filter aquariums up to a 240 litre capacity as the primary filter or act as a supplementary filter in a larger aquarium. These internal, underwater filters feature a three-stage filter with Biomax for superior aquarium water quality. The filters come in a range of sizes, to suit a variety of aquarium setups.

What are the benefits of the Fluval U Series Filters?

The Fluval U Series Filters have a range of features including:

  • Flip-top access - Access via a convenient flip-top lid to quickly and easily reach in and change the filter cartridge.
  • Custom flow patterns - Fluval U series filters provide the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The Adjustable 3-Way Flow Control feature (U2, U3 and U4 models) lets you position the water flow output to meet your specific needs. 
  • A setting for every need - 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.

How long does a Fluval filter last?

The Fluval U filter range can be used in freshwater, marine or reptile environments and all come with a 3-year guarantee. However, Fluval filters can last much longer if well maintained and cared for with regularly replaced media. You can purchase replacement media for these filters, which are quick and easy to change over. 



Brand Fluval
Guarantee 3 years limited


Product U Series filter Mini U Series Filter U1 U Series Filter U2 U Series Filter U3 U Series Filter U4
Aquarium capacity 45ltrs 55ltrs 45-110ltrs 90-150ltrs 130-240ltrs
Pump output - 250lph 400lph 600lph 1000lph
Wattage (120V/60Hz) 5W 5W 5W 6W 12W
Wattage (230-240V/50Hz) - 4.5W 5W 6W 12W
Dimensions - L:10 x W:8 x H:15cm L:20 x W:9 x H:10cm L:26.7 x W:8.3 x H:10cm L:33 x W:10 x H:11cm
Cable length - 180cm 180cm 180cm 180cm
Includes 1 foam pad 1 foam pad 2 foam pads, 2 poly/carbon cartridges, BioMax biological rings 2 foam pads, 2 poly/carbon cartridges, BioMax biological rings 2 foam pads, 2 poly/carbon cartridges, BioMax biological rings
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