Description

Fluval U Range Internal Filters

The Fluval U Range Internal Filters provide reliable, energy-efficient aquarium filtration in a compact and versatile design. Available in four sizes to suit aquariums up to 240 litres, these fully submersible filters combine effective water circulation with convenient maintenance and flexible installation options.

Designed for freshwater and marine aquariums, the Fluval U Series offers an excellent alternative to external filtration, particularly where space is limited or a straightforward, self-contained filtration system is preferred.

With adjustable water flow, easy-access filter media and the option of vertical or horizontal installation, the range offers practical filtration solutions for everything from smaller community aquariums to larger established setups.

Fluval U Range Internal Filters – Key Features

• Four models available – U1, U2, U3 and U4, suitable for aquariums up to 240 litres.
• Effective aquarium filtration – removes suspended debris and supports good water quality.
• Multi-stage filtration – U2, U3 and U4 combine mechanical, biological and chemical filtration.
• Adjustable water flow – allows circulation to be tailored to the aquarium.
• Three-way outlet system – offers different flow patterns on U2, U3 and U4 models.
• Vertical or horizontal installation – suitable for a variety of aquarium layouts.
• Convenient flip-top access – makes routine cleaning and media replacement easier.
• Low energy consumption – efficient operation for continuous filtration.
• Filter media included – supplied with the appropriate filtration materials for each model.

Effective Multi-Stage Aquarium Filtration

The Fluval U Series helps maintain clean aquarium water by removing suspended waste and providing suitable surfaces for beneficial bacteria.

The U2, U3 and U4 models feature three stages of filtration.

Mechanical filtration uses foam pads to capture fish waste, uneaten food and other suspended particles before they accumulate throughout the aquarium.

Biological filtration uses Fluval BIOMAX media to provide surfaces for beneficial bacteria, which convert harmful ammonia and nitrite into less harmful nitrate.

Chemical filtration uses poly/carbon cartridges to help remove certain dissolved impurities, odours and discolouration while capturing fine debris.

The smaller U1 uses a simpler foam-based filtration system, making it particularly suitable for compact aquariums requiring straightforward filtration and water circulation.

Adjustable Water Flow for Different Aquariums

One of the most useful features of the Fluval U Range is its ability to adapt water circulation to different aquarium requirements.

The U2, U3 and U4 models feature three selectable water outlets.

Top Outlet: Produces stronger circulation near the surface, helping promote water movement and oxygen exchange.

Integrated Spray Bar: Distributes water more evenly, creating a gentler flow that can be particularly useful in planted aquariums.

Bottom Outlet: Directs water movement towards the lower areas of the aquarium, helping reduce stagnant areas and circulate water around decorations.

The U1 features adjustable water flow but does not include the three-way outlet system found on the larger models.

Flexible Vertical or Horizontal Installation

Fluval U Series filters can be installed vertically against the aquarium glass or positioned horizontally where appropriate.

Vertical installation is ideal for conventional aquariums, allowing the filter to provide effective circulation while occupying relatively little space.

Horizontal positioning is particularly useful for shallow aquariums, turtle setups and aquariums with lower water levels.

This flexibility also makes the range suitable for creating gentle water movement around decorative features.

Always ensure the filter is installed and submerged according to the manufacturer’s instructions.

Easy Cleaning and Maintenance

Regular filter maintenance is essential for maintaining reliable water circulation and healthy aquarium conditions.

Fluval U Series filters feature a convenient flip-top lid that provides easy access to the filtration cartridges without requiring complicated dismantling.

The filter can be tilted away from its mounting bracket, making it easier to inspect and remove the media for cleaning.

Reusable foam and biological media should be rinsed gently in water removed from the aquarium to preserve beneficial bacteria.

Avoid replacing all established biological media simultaneously, as this can disrupt the aquarium’s nitrogen cycle.

Which Fluval U Series Filter Do I Need?

The Fluval U Range includes four models, each designed for a different aquarium capacity.

Fluval U1 – Up to 55 Litres

The smallest model in the range, ideal for compact tropical aquariums and smaller setups requiring simple internal filtration.

With a maximum pump output of 250 LPH, the U1 provides effective mechanical filtration and adjustable water circulation.

Fluval U2 – Up to 110 Litres

A versatile option for smaller community aquariums, offering a maximum pump output of 400 LPH.

The U2 introduces three-stage filtration with BIOMAX biological media and the adjustable three-way outlet system.

Fluval U3 – Up to 150 Litres

Designed for medium-sized aquariums, the U3 delivers a maximum pump output of 600 LPH.

Its increased filtration capacity makes it suitable for established community aquariums requiring dependable mechanical and biological filtration.

Fluval U4 – Up to 240 Litres

The largest model in the range, providing a maximum pump output of 1,000 LPH.

With generous filter media capacity and flexible water circulation, the U4 is ideal for larger community aquariums or as supplementary filtration in bigger systems.

Are Fluval U Range Internal Filters Suitable for Your Aquarium?

These filters are particularly suitable for:

• Tropical community aquariums
• Planted freshwater aquariums
• Smaller coldwater aquariums with appropriate stocking
• Suitable marine aquariums requiring internal filtration
• Turtle and other aquatic reptile setups with suitable water levels
• Supplementary filtration in larger aquariums

The most suitable model will depend on aquarium volume, stocking levels, feeding habits and the amount of waste produced.

For heavily stocked aquariums or particularly messy fish, choosing a larger filter or adding supplementary filtration may be beneficial.

Why Choose Fluval U Range Internal Filters?

The Fluval U Series combines dependable filtration, flexible installation and convenient maintenance in a compact internal design.

Unlike external filters, these units require no external plumbing or aquarium cabinet space, making them particularly appealing for smaller aquariums or setups where simplicity is important.

With four models available, the range offers a practical filtration solution for a wide variety of freshwater and marine aquariums.

If you have any questions about this product and whether it’s the right filter for your aquarium, please contact us and a member of our friendly store team will be more than happy to answer all of your questions.

Further information available at fluvalaquatics.com