U Series Underwater Filter

U Series Underwater Filter

Offering outstanding 3-stage filtration, increased water movement and vital aeration, Fluval U-Series internal filters are the perfect solution where external filtration is not possible.

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U Series

Offering outstanding 3-stage filtration, increased water movement and vital aeration, U Series internal filters are the perfect solution where external filtration is not possible.

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Adjustable 3-way flow control for customized water circulation and oxygenation

Convenient flip-top lid for ultra fast media changes

Versatile horizontal and vertical mounting options 

Adjustable 3-way flow control for customized water circulation and oxygenation

Convenient flip-top lid for ultra fast media changes

Versatile horizontal and vertical mounting flexibility

Available Models

U Series Underwater Filters

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Unique 3-Stage Filtration

For crystal clear water conditions.

Mechanical Stage
Biological Stage
Chemical Stage

Free Media Included

Foam filter pads remove large particles (U1 includes stage 1 only).

Foam Filter Pad

U1 (1) U2/U3/U4 (2)

Poly carbon pads remove fine debris, odors and improve water clarity.

Poly/Carbon Pads

U2/U3/U4 (2)

BioMax filter nodes biologically balance water chemistry for a healthy environment.

BioMax

U2,U3 (40 g) U4 (80 g)

Quick Flip Top Maintenance

Easy to remove for fast filter access.

Tilt

To remove from bracket

Flip

To access inside filter

Replace

Or clean filter media

Adjustable 3-Way Flow

For customized water circulation and oxygenation.

Top Output

Maximizes circulation and oxygenation

Middle Output

Spray bar for gentle flow in planted aquariums

Bottom Output

Deep water agitation

Versatile Positioning

U Series filters can be used as a primary filter in smaller aquariums or as a supplementary filter for larger aquariums.

Vertically

To create currents or customize water flows.

Horizontally

For shallow tanks, larger tanks with low water, or to create a decorative waterfall feature.

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