The Adjustable 3-Way Flow Control feature (U2, U3 and U4 models) lets you position the water flow output to meet your specific needs. The new Fluval U Series of filters may look the same, but there have been several tweaks to improve the design. For shallow tanks, lay it vertically to create a decorative waterfall feature. The long and slim structure of this water filter allows it to be placed horizontally. Using a three-level system with three varied types of filtration pads, this aquarium water filter ensures improved water quality and a healthy environment for fish. From saltwater to freshwater, the Fluval water filter is suitable for all kinds of setups with or without reptiles and plants. Fluval U series filters provide the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The filter provides the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The adjustable 3-way flow control feature lets you position the water flow output to meet your specific needs. The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deepwater agitation.

Fluval U4 Underwater Filter provides complete and efficient 3-stage filtration, including BioMax biological filtering, to create superior aquarium water quality. The U4 Filter includes practical and versatile features, making it ideal for application in fresh, marine and reptile environments. Fluval U Underwater Filter provides complete and efficient 3-stage filtrationto create superior aquarium water quality. All models come with a Bio-Foam filter pad to remove large particles. The larger 2 sizes also include a Poly-Carb pad to assist with removal of fine particles, chemicals and odours. They also have the addition of Biomax filter nodes to assist with biological filtration. The more things change, the more they stay the same. Except in the case of the Fluval U range of internal filters. They’ve changed, and they’ve gotten a bit better, says Nathan Hill. Fluval's new Fluval U4 filter. Large pallet items like aquariums are deemed delivered successfully with no damage once the the driver has left the property. If a report of damage is submitted after the driver has left we may be unable to assist with replacements. We recommend refusing a damaged delivery, this is the fastest resolution.

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The complete line, consisting of Fluval U1, U2, U3 and U4 Underwater Filters, includes many practical and versatile features that make them ideal for application in fresh, marine and reptile environments.

The Fluval U1 Underwater Filter is ideal for use in fresh, marine or reptile environments. Use the U1 as a primary filter in smaller aquariums or as a supplementary filter for larger aquariums. It is also ideal for tanks with low water levels. The U1 includes an adjustable flow control and comes complete with 1 foam pad.

The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deep-water agitation.