FLUVAL U4 Internal Filter

FLUVAL U4 Internal Filter is a powerful and versatile aquarium filtration system designed to provide outstanding 3-stage filtration, enhanced water circulation, and essential aeration for a healthier aquatic environment. Suitable for aquariums up to 240 litres, the U4 is the ideal solution when external filtration is not practical, delivering exceptional mechanical, chemical, and biological filtration in a compact internal unit.

Perfect for both freshwater and marine aquariums, as well as reptile habitats, the Fluval U4 can be used as a primary filter in smaller tanks or as supplementary filtration in larger aquarium setups. Its flexible mounting options allow for either horizontal or vertical positioning, enabling aquarists to create customised water movement and flow patterns based on the needs of their aquatic inhabitants.

The U4 features an adjustable 3-way flow control system that provides complete flexibility over water circulation. The top output promotes oxygenation and surface movement, the integrated spray bar delivers a gentle and even flow, while the bottom output creates effective deep-water agitation to help maintain optimal water conditions throughout the aquarium.

• Advanced 3-stage filtration for crystal-clear, healthy aquarium water
• Designed for aquariums up to 240 litres
• Suitable as a primary filter for smaller aquariums or a supplementary filter for larger tanks
• Horizontal positioning for shallow aquariums, low water levels, or decorative waterfall effects
• Vertical installation creates customised currents and enhanced water circulation
• Adjustable 3-way flow control for tailored filtration performance
• Top output improves circulation and oxygenation
• Integrated spray bar provides a gentle, even flow throughout the aquarium
• Bottom output generates deep-water agitation for improved water quality
• Convenient flip-top lid allows quick and easy access for maintenance and media replacement
• Includes BIOMAX biological media to support beneficial bacteria and efficient biological filtration
• Made in Italy for premium quality and dependable performance
• Ideal for freshwater, saltwater and reptile environments

What's Included:

• 2 Foam Pads
• 2 Poly/Carbon Cartridges
• BIOMAX Biological Rings

The FLUVAL U4 Internal Filter offers the perfect balance of filtration power, flexibility, and ease of maintenance. Designed for larger aquariums and demanding aquatic environments, it helps maintain excellent water quality, increased oxygen levels, and a cleaner, healthier habitat for fish, invertebrates, and aquatic reptiles.