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Fluval Underwater Filter U-Series by by Fluval

Best Seller
  • $115.99
  • (50%)
In Stock. Ships within 1 business day.
SKU: XA0475
UPC: 015561104753
MPN: A475

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Product Description

Fluval Underwater Filters are powerful 3-stage filtration systems perfect for aquariums and reptile environments.

  • Easy flip top for fast maintenance
  • 3 Stage filtration is ideal for freshwater, marine or reptile environments
  • Includes submersible filter, 1 foam pad, output diverter and 3-way flow rate control

These filters are perfect as primary filtration in smaller aquariums and supplementary filtration in larger aquariums. Also great for tanks with low water levels and will run efficiently in a horizontal or vertical position. Cord length is 6 feet!


  • 155 GPH
  • 7.5 Watt
  • 24-40 Gallons
  • 3.5"L x 3"W x 10.5"H

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Mike, Smithtown NY on 08-16-2011
Great filter

I was struggling with cloudy, dirty water for the longest time in my 20 gallon tank. I did not obey the "overfilter" rule. I installed this and within 48 hours the water was crystal clear.

Kevin, Housatonic MA on 08-09-2011
Best internal on the market

I currently have the U1 and U2 and plan to get the U4 for my bigger tank. And I must say, this is my favorite filter on the market. I not only love the filtering job it does for my turtle tanks, but I love all the features that other filters lack. For example, you can change where the clean water comes out and how hard it comes out, you can take the filter out of the tank without removing those pesky suction cups, and I really like how it looks overall.( Please note, U1 model only has foam, and doesn't have some of the features that U2 U3 and U4 have.) It may be kind of expensive, but you get a great deal here on Petmountain.