Keep your aquarium water clean, clear, and healthy with the Fluval U Underwater Aquarium Filter. Designed for small to medium-sized aquariums, this powerful internal filter combines advanced 3-stage filtration, adjustable water flow, and easy maintenance to provide reliable performance for freshwater, marine, and reptile aquatic environments.

The compact internal design allows the filter to sit neatly inside your aquarium without external hoses or bulky equipment. The advanced filtration system helps remove fine particles, unwanted chemicals, and odours while improving water circulation and oxygenation for a healthier aquatic environment.

With flexible installation options, adjustable flow control, an integrated spray bar, and a convenient flip-top maintenance system, the Fluval U Series is an excellent choice for both beginner aquarists and experienced fish keepers.

Key Features

✅ Advanced 3-Stage Filtration
Combines mechanical, chemical, and biological filtration to help maintain crystal-clear aquarium water and a healthier environment.

✅ Adjustable Water Flow Control
Customize water movement and circulation to match your aquarium setup and fish requirements.

✅ Integrated Spray Bar System
Creates gentle and even water distribution, making it suitable for planted aquariums and delicate aquatic species.

✅ Quick Flip-Top Maintenance
Easy-access design allows fast cleaning and simple filter media replacement without removing the entire unit.

✅ Flexible Installation Options
Can be installed vertically for stronger circulation or horizontally for shallow tanks and decorative waterfall effects.

✅ Freshwater & Marine Compatible
Suitable for freshwater aquariums, saltwater setups, and reptile aquatic habitats.

✅ Compact Internal Design
Provides powerful filtration while saving space and keeping your aquarium setup clean and organised.

Available Models

Fluval U1

Suitable For: Aquariums up to 55L
Ideal For: Nano and small freshwater tanks

Fluval U2

Suitable For: Aquariums 45–110L
Ideal For: Small to medium aquarium systems

Fluval U3

Suitable For: Aquariums 90–150L
Ideal For: Medium freshwater aquariums

Fluval U4

Suitable For: Aquariums 130–240L
Ideal For: Larger aquarium setups

Package Includes

• 1 × Fluval U Underwater Aquarium Filter
• 1 × Mechanical Filter Media
• 1 × Chemical Filter Media
• 1 × Biological Filter Media (selected models)
• 1 × Integrated Spray Bar
• 1 × Mounting Bracket
• 1 × Instruction Manual

Specifications

Brand: Fluval
Series: U Underwater Filter Series
Filter Type: Internal Aquarium Filter
Filtration: 3-Stage Mechanical, Chemical & Biological
Installation: Fully Submersible Internal Filter
Water Compatibility: Freshwater / Marine / Reptile
Flow Control: Adjustable
Models Available: U1, U2, U3, U4

Perfect For

🐠 Freshwater aquariums
🌿 Planted aquarium setups
🦐 Shrimp and nano tanks
🐢 Aquatic reptile habitats
🏠 Home and office aquariums