• Optimal water filtration system for aquariums that ensures proper oxygenation for clear water and a healthy environment.
  • Fine foam pad traps small debris while bio-foam captures larger debris and nitrifying bacteria.
  • Adjustable 3-way flow control—top output for circulation and oxygenation, integrated spray bar for a gentle even flow, and bottom output for deepwater agitation.
  • Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement.
  • Ideal for freshwater, saltwater and reptile environments.

Fluval's Underwater Filter is an optimal water filtration system for aquariums. Equipped with foam filter media, it helps to provide effective and thorough mechanical and biological filtration. A fine foam pad traps small debris while a bio-foam captures debris and nitrifying bacteria. The nano filter has adjustable output with an attachable spray bar that distributes a gentle, even flow of water, making it safe for delicate fish or shrimp. This is also great for use with aquatic turtles and terrestrial turtles.

Specifications
Item Number U1-103940  
Dimensions 6.5 x 5.2 x 3.8 inches
Tank Size 11 to 20 Gallons
Aquarium Type Freshwater, Saltwater
Season N/A
Fish Type Tropical Freshwater, Marine Fish
Material Plastic
Reptile Type Aquatic Turtle, Painted Turtle, Map Turtle, Red-Eared Slider Turtle, Asian Box Turtle
What's Included

U1: Filter unit , (1) foam pad.

U2, U3, U4: Filter unit, (2) foam pads, (2) poly/carbon cartridges , BioMax biological rings.

  • Optimal water filtration system for aquariums that ensures proper oxygenation for clear water and a healthy environment.
  • Fine foam pad traps small debris while bio-foam captures larger debris and nitrifying bacteria.
  • Adjustable 3-way flow control—top output for circulation and oxygenation, integrated spray bar for a gentle even flow, and bottom output for deepwater agitation.
  • Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement.
  • Ideal for freshwater, saltwater and reptile environments.

Fluval's Underwater Filter is an optimal water filtration system for aquariums. Equipped with foam filter media, it helps to provide effective and thorough mechanical and biological filtration. A fine foam pad traps small debris while a bio-foam captures debris and nitrifying bacteria. The nano filter has adjustable output with an attachable spray bar that distributes a gentle, even flow of water, making it safe for delicate fish or shrimp. This is also great for use with aquatic turtles and terrestrial turtles.

Specifications
Item Number U2-103941
Dimensions 8.7 x 5.2 x 3.8 inches
Tank Size 21 to 30 Gallons
Aquarium Type Freshwater, Saltwater
Season N/A
Fish Type Tropical Freshwater, Marine Fish
Material Plastic
Reptile Type Aquatic Turtle, Painted Turtle, Map Turtle, Red-Eared Slider Turtle, Asian Box Turtle
  • Optimal water filtration system for aquariums that ensures proper oxygenation for clear water and a healthy environment.
  • Fine foam pad traps small debris while bio-foam captures larger debris and nitrifying bacteria.
  • Adjustable 3-way flow control—top output for circulation and oxygenation, integrated spray bar for a gentle even flow, and bottom output for deepwater agitation.
  • Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement.
  • Ideal for freshwater, saltwater and reptile environments.

Fluval's Underwater Filter is an optimal water filtration system for aquariums. Equipped with foam filter media, it helps to provide effective and thorough mechanical and biological filtration. A fine foam pad traps small debris while a bio-foam captures debris and nitrifying bacteria. The nano filter has adjustable output with an attachable spray bar that distributes a gentle, even flow of water, making it safe for delicate fish or shrimp. This is also great for use with aquatic turtles and terrestrial turtles.

Specifications
Item Number U3-103942
Dimensions 11.7 x 5.2 x 4.3 inches
Tank Size 31 to 40 Gallons
Aquarium Type Freshwater, Saltwater
Season N/A
Fish Type Tropical Freshwater, Marine Fish
Material Plastic
Reptile Type Aquatic Turtle, Painted Turtle, Map Turtle, Red-Eared Slider Turtle, Asian Box Turtle
 
  • Optimal water filtration system for aquariums that ensures proper oxygenation for clear water and a healthy environment.
  • Fine foam pad traps small debris while bio-foam captures larger debris and nitrifying bacteria.
  • Adjustable 3-way flow control—top output for circulation and oxygenation, integrated spray bar for a gentle even flow, and bottom output for deepwater agitation.
  • Convenient flip-top lid allows for quick and easy access to filter cartridge for maintenance or replacement.
  • Ideal for freshwater, saltwater and reptile environments.

Fluval's Underwater Filter is an optimal water filtration system for aquariums. Equipped with foam filter media, it helps to provide effective and thorough mechanical and biological filtration. A fine foam pad traps small debris while a bio-foam captures debris and nitrifying bacteria. The nano filter has adjustable output with an attachable spray bar that distributes a gentle, even flow of water, making it safe for delicate fish or shrimp. This is also great for use with aquatic turtles and terrestrial turtles.

Specifications
Item Number U4-103943
Dimensions 14 x 5.2 x 4.6 inches
Tank Size 56 to 75 Gallons
Aquarium Type Freshwater, Saltwater
Season N/A
Fish Type Tropical Freshwater, Marine Fish
Material Plastic
Reptile Type Aquatic Turtle, Painted Turtle, Map Turtle, Red-Eared Slider Turtle, Asian Box Turtle
 
 
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