Fluval U Series Underwater Filters – Internal Aquarium Filters for 55L to 240L Tanks

The Fluval U Series (U1, U2, U3, U4) are electrically powered internal aquarium filters that mount inside the tank using suction cups. Covering tank sizes from 55 litres (U1) to 240 litres (U4), they deliver full three-stage filtration — mechanical, chemical, and biological — in a compact underwater format. Output can be configured as a spray bar, a waterfall for surface aeration, or a directional nozzle for targeted flow. Media trays are accessible from above the waterline for easy cleaning. Ideal for breeding tanks, quarantine setups, nano aquariums, and secondary filtration in larger systems.
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