Fluval U3 Underwater Filter (90-150 L) is a compact internal filtration solution offering a complete 3-stage filtration system with BIOMAX biological media for freshwater, saltwater, and reptile aquariums. Designed for tanks up to 150 L, it promotes efficient water movement and vital aeration while remaining unobtrusive in the display.

Its redesigned media cartridge traps more debris, and a convenient flip-top lid enables quick cartridge access for maintenance. Use the U3 as a primary filter in smaller setups or as a supplementary filter in larger systems. It can be positioned horizontally for shallow tanks or to create a decorative waterfall, or vertically along the glass to generate currents and tailored flow patterns.

Three-way flow control includes a top output for circulation and oxygenation, a spray bar for gentle, even distribution, and a bottom output for deeper water agitation. The unit arrives with BIOMAX media and is suitable for a wide range of environments.

Technical details: 7.5 W at 120 V / 60 Hz (6 W at 230–240 V / 50 Hz); maximum flow around 600 L/h; dimensions 10 × 8.3 × 26.5 cm.