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Fluval U4 Underwater Filter, Freshwater and Saltwater Aquarium Filter, A480

4.5 out of 5 stars 1,489 ratings

Price: $139.00
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Enhance your purchase

Breed recommendation Small Breeds
Brand Fluval
Colour Black
Material Metal
Item weight 1.12 Kilograms

About this item

  • Use as a primary filter for smaller aquariums, or supplementary filter for larger aquariums
  • Sleek design with easy grip water control panel and redesigned media cartridge to trap more debris
  • Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement
  • Position horizontally for shallow tanks, larger tanks with low water levels, or to create a decorative waterfall feature or vertically against aquarium wall to create currents or customized flow patterns
  • Designed for freshwater, saltwater and reptile environments up to 65 gallons
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 11.68 x 13.21 x 35.56 cm; 1.12 Kilograms
  • Date First Available ‏ : ‎ 2 July 2019
  • Manufacturer ‏ : ‎ Fluval
  • ASIN ‏ : ‎ B001XRXY1G
  • Item Model Number ‏ : ‎ A480A1
  • Department ‏ : ‎ Men, women
  • Customer Reviews:
    4.5 out of 5 stars 1,489 ratings

Frequently bought together

  • Fluval U4 Underwater Filter, Freshwater and Saltwater Aquarium Filter, A480
  • +
  • Fluval U4 Poly / Carbon Cartridge
  • +
  • Fluval U4 Underwater Filter Foam Pad
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Product description

Fluval U4 Underwater Filter is ideal for use in all aquarium or reptile environments. Use the underwater filter as a primary filter in smaller aquariums or as a supplementary filter for larger aquariums. Fluval Underwater Filters with three-stage filtration are ideal for use in fresh, marine or reptile environments, and are also great for tanks with low water levels. Three-stage filtration with BioMax for superior aquarium water quality, flip-top access for quick and easy cartridge replacement, and three-way flow control make the new Fluval U Series the benchmark in underwater filtration. Stage 1 foam removes large particles. In stage 2, the poly/carbon cartridge traps fine debris, improves water clarity and removes impurities. In stage 3, BioMax provides optimal biological filtration efficiency.

For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.


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Customer reviews

4.5 out of 5 stars
4.5 out of 5
1,489 global ratings

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Top review from Australia

Reviewed in Australia on 5 September 2020
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Top reviews from other countries

Paul J Davies
5.0 out of 5 stars So Much better than my old filter.
Reviewed in the United Kingdom on 15 April 2020
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10 people found this helpful
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Glenn Perry
5.0 out of 5 stars Fantastic filter for my 80l tank
Reviewed in the United Kingdom on 7 March 2018
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5.0 out of 5 stars Fantastic filter for my 80l tank
Reviewed in the United Kingdom on 7 March 2018
I bought this for my 80l tank as my U3 started to fail. I hoped it wouldn't be too powerful for my tank and it isn't. It works great and left the water crystal clear within a few hours (I'd cleaned the tank just before I installed it). I followed the instructions to the latter and all worked perfectly and lovely and quiet. Mine is just below water level and makes the plants (fake) sway which is nice. Just enough agitation for my clown loaches to enjoy. I've not tried the middle or lower outlets so can't comment on them. I just transferred the bio stuff from my old U3 into this one and all is good. I'm hoping I won't have to clean the filter as much as the U3. All in all, physically it's probably just a bit big for my tank but power wise it's perfect. I had to do some research as I noticed the blue baskets that hold the filters half of the holes were covered up which I thought was odd but apparently it's a new design to trap more debris. For the price this filter is fantastic and should need less cleaning (for my 80l tank), although I also use a water conditioner.
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13 people found this helpful
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Jacob L.
5.0 out of 5 stars I wouldnt use anything else
Reviewed in the United Kingdom on 21 May 2018
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10 people found this helpful
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eve3981
4.0 out of 5 stars Fabulous but with a serious design flaw
Reviewed in the United Kingdom on 24 November 2021
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Voice of Reason
5.0 out of 5 stars Superb
Reviewed in the United Kingdom on 11 October 2013
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28 people found this helpful
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