Fluval U3 Submersible Aquarium Filter

Get crystal-clear water and a healthier environment for your fish without breaking a sweat

Product Price

$67.99 $38.99

Product Review Score

4.12 out of 5 stars

47 reviews

Product Brand

Product Summary

The Fluval U3 Submersible Aquarium Filter has a sleek design and an easy grip water control paddle that makes adjusting flow a breeze. It can handle aquariums up to 40 gallons, works great as a main filter for smaller tanks or a backup for larger ones, and even lets you create customized flow patterns or a decorative waterfall.

We found the best options for you

Loading...

When you order through these links, we may earn a commission at no additional cost to you.

Additional Product Details

  • Works great as a main filter for smaller tanks or as an extra filter for bigger ones
  • Sleek design that fits nicely in your aquarium and has an easy grip control panel
  • Redesigned media cartridge catches more debris, so your water stays cleaner for longer
  • Quick access flip-top lid makes it easy to check or change the filter cartridge without hassle
  • Position it horizontally for shallow tanks, low water levels, or to create a cool waterfall effect
  • Stand it up against the aquarium wall to create custom water currents or flow patterns
  • Perfect for freshwater, saltwater, or even reptile tanks up to 40 gallons

Elevate Your Aquatic Experience with Our Premium Tanks

View more Fluval products.

Our Policies

Secure Checkout
Guaranteed safe & secure
Fast Shipping
Fast shipping to your doorstep
AquaTech EZ-Change Aquarium Filter Cartridges, 6-Pack

AquaTech EZ-Change Filters 6-Pack

Product Review Score

4.47 out of 5 stars

125 reviews

$13.97

Tetra Whisper Medium Bio-Bag Cartridge 3 Pack

Tetra Whisper Bio-Bag 3-Pack

Product Review Score

4.91 out of 5 stars

168 reviews

$3.39

Tetra Whisper Bio-Bag Filter for Large Aquariums

Bio-Bag Filter for Aquatics

Product Review Score

4.94 out of 5 stars

30 reviews

Marineland Penguin 200GPH Multi-Stage Power Filter

Marineland Penguin Power Filter

Product Review Score

4.12 out of 5 stars

191 reviews

$28.89