Fluval U-Serie Internal Filter

Fluval U-Serie Internal Filter

  • Compact internal filter
  • Vertical and horizontal installation possible
  • Filter material included
  • Available in 4 different dimensions
  • For freshwater and saltwater aquariums
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Description

The Fluval U-Series internal filters are characterised by great versatility. The filter can be attached vertically and horizontally in the aquarium. In this way, it can also be used for shallow waters and decorative waterfalls, for example.
The flow can be adjusted continuously, and the outlet can even be selected at three different points in the U2, U3 and U4 versions. Such flexibility ensures that the U series can be used in a wide range of applications. The small U1 filter can also be used in nano aquariums and has a foam filter cartridge. All larger filters in the U series offer the convenience of 3-stage filtration. They use the full power of mechanical, chemical and biological filtration. The matching filter media are included in the scope of delivery. For better maintenance, the filters can be removed from their holder and opened at the top head. From there, all filter media can be changed.
All U-series filters provide excellent cleaning, agitation and oxygenation of the water. In this way, they contribute to the vitality of aquatic plants and aquarium inhabitants. The unobtrusive appearance of the filters means they do not detract from a beautifully designed layout. They are suitable for use in freshwater and marine aquariums.

Manual Fluval U-Serie Inner Filter - - download PDF

Features

  • Compact internal filter from Fluval
  • U1 also suitable for nano tanks
  • From U2 with 3-stage filtering
  • Steppless adjustable flow controll
  • Vertical and horizontal mounting possible
  • Three different outlet points
  • Available in four different sizes
  • Suitable for freshwater and marine aquariums

Technical data

Fluval U-Serie Internal Filter - U1
Max. flow rate 250 l/h
Power consumption 4,5 W
Fluval U-Serie Internal Filter - U2
Max. flow rate 400 l/h
Input 5 W
Fluval U-Serie Internal Filter - U3
Max. flow rate 600 l/h
Power consumption 6 W
Fluval U-Serie Internal Filter - U4
Max. flow rate 1.000 l/h
Power consumption 10 W

Dimensions

Fluval U-Serie Internal Filter - U1
Height 150 mm
Depth 80 mm
Width 100 mm
Suitable for aquarium size Up to 55 liters
Fluval U-Serie Internal Filter - U2
Height 200 mm
Depth 90 mm
Width 100 mm
Suitable for aquarium size Approx. 45 to 110 liters
Fluval U-Serie Internal Filter - U3
Height 267 mm
Depth 83 mm
Width 100 mm
Suitable for aquarium size Approx. 90 to 150 liters
Fluval U-Serie Internal Filter - U4
Height 330 mm
Depth 100 mm
Width 110 mm
Suitable for aquarium size ca. 130 Liter bis 240 Liter

Scope of delivery

Fluval U-Serie Internal Filter - U1
  • Foam filter cartridge
Fluval U-Serie Internal Filter - U2
  • 2x Foam filter cartridge
  • 2x Polyester/activated carbon filter cartridge
  • BioMax biological filter rings
Fluval U-Serie Internal Filter - U3
  • 2x Foam filter cartridge
  • 2x Polyester/activated carbon filter cartridge
  • BioMax biological filter rings
Fluval U-Serie Internal Filter - U4
  • 2x Foam filter cartridge
  • 2x Polyester/activated carbon filter cartridge
  • BioMax biological filter rings

Product Safety Notes

General notes:

  • Follow the operating instructions.

Fluval

Fluval

Since 1975, Fluval has been offering advanced aquarium technology such as filters, lighting solutions and complete aquarium systems with a high degree of quality and innovation. Fluval's pioneering spirit is reflected in constantly modern products that meet the changing times and fast pace in the field of aquaristics with functionality and robustness. Fluval is not only committed to the much-loved hobby of aquaristics, but also to the preservation of the environment through coral conservation projects, species protection programmes and also works in a close context with the aquaristics community.

Manufacturer information

Manufacturer
Name HAGEN Deutschland GmbH & Co. KG
Street Lehmweg 99 - 105
City 25488 Holm
State Schleswig-Holstein
Country Deutschland
E-mail customer.service-de@rchagen.com
Website hagen-deutschland.com

General information

Item no.
186.0100.02
EAN 015561104708
Weight 0,76 kg
Shipping weight 0,80 kg

Questions and answers about Fluval - U-Serie Internal Filter

You have questions about this product? Ask other customer or our support team about this product!

Hello, I wanted to ask whether the Fluval U2 is suitable for 54 l. It will have shrimp, dwarf armored catfish and neon tetras and lots of plants!
Translated from German
Ömer Kaan Y.
Oct. 2025
Lisa Pogodda
Nov. 2025
Support
The Fluval U-Serie Internal Filter U2 is suitable for a tank size of approx. 45 liters to 110 liters. However, the filter is not safe for shrimp and baby fish.
Translated from German
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Customer reviews

This item has been rated 4 out of 5 stars
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1 Star(0)
Kevin R.
Recommended. Very large but safe for smaller fish.
1st September 2022
Fluval - U-Serie Internal Filter - U2
Fluval - U-Serie Internal Filter - U2

From the start I replaced the middle cartridge with a few pieces of Seachem Matrix. Not many fit in there anyway. (read more)

Translated from German
Show original

Empfehlenswert. Sehr groß aber sicher für kleinere Fische.

Ich habe von Anfang an die mittlere Kartusche ausgetauscht mit ein paar Steinchen Seachem Matrix.

Viele passen da sowieso nicht herein.

Hab diesen Filter genutzt um beim kompletten rescape das Becken etwas durchzuwirbeln und mit dem enthaltenen Aktivkohlefilter die Trübung durchs neue Holz zu reduzieren (was funktioniert hat)

Er ist wunderbar modular aber ich habe ihn nur im aufrechten Modus genutzt.

Den Aufstecker für die Ausfluss Reduktion hab ich entfernt für maximale Umwälzung.

Er hat im ADA 60p eine ausreichende Umwälzung gehabt. Ohne Fischbesatz wäre er auch ausreichend gewesen zum Dauerbetrieb wenn man das denn so handhaben möchte da das Ungetüm sehr groß ist.

Reinigung ist Kinderleicht und auch während der Filter im Aquarium hängt kann man

die Filterkammern überprüfen ohne ihn heraus zu nehmen.

Von wo der Filter ansaugt ist mir nie ganz klar geworden. Auch beim anbringen von Starterbakterien die man im Wasser sieht schien alles nur so um den Filter herum sich zu verteilen anstatt an einer Stelle spezifisch angesaugt zu werden.

Vermutlich ist das ein Vorteil da so die Gefahr vom Ansaugen kleinerer Fische minimal bleibt!