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Fluval

Fluval U3 Underwater Filter – Designed for Freshwater and Saltwater Aquariums, Also Ideal for Terrariums and Turtle Tanks

4.1
Based on 10,701 reviews
Independent Analysis
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Technical Specifications

Complete product details

Brand
Fluval
Product Dimensions
12"L x 6"W x 5"H
Package Information
box
Installation Type
Sticks to the side of the aquarium.
Power Source
Corded Electric
Item Weight
798 Grams
Model Name
HAGEN FLUVAL U3 UNDERWATER FILTER
Maximum Flow Rate
600 Liters Per Hour
Supported Water TDS Level Maximum (PPM)
300
UPC
015561104753 015561104869
Global Trade Identification Number
00015561104753
Manufacturer
Rolf C. Hagen (USA) Corp.
Item Weight
1.76 pounds
ASIN
B001TKZ51E
Item model number
A475A1
Customer Reviews
4.1 4.1 out of 5 stars 10,701 ratings 4.1 out of 5 stars
Date First Available
August 19, 2004
Item Package Dimensions L x W x H
11.46 x 5.28 x 4.17 inches
Item Dimensions LxWxH
10.5 x 3.25 x 4 inches
Brand Name
Fluval
Target Audience Keyword
algae-eaters, arachnids, arthropods, bats-animals, bearded-dragons, bees, beetles, betta-fish, bottom-feeder-fish, butterflies, cichlid-fish, crabs, dragonflies, fish, frogs, geckos, goldfish, hermit-crabs, iguanas, insects, invertebrate-fish, ladybugs, lizards, mollusks, newts, octopuses, rays, reptiles, salamanders, sharks, snails, snakes, spiders, tortoises, turtles
Directions
Follow instuctions on product
Country of Origin
Italy
Warranty Description
3 years; Fluval U Series Power Filters are guaranteed against defects in material or workmanship under normal aquarium usage and service for 3 years. We offer a 3 year guarantee on all nonreplaceable parts which means that the filter will be repaired or replaced at the manufacturer's discretion, free of charge, when the complete pump is returned with proof of purchase and postage paid. This warranty does not apply to any filter that has been subjected to misuse, negligence, or tampering. No liability is assumed with respect to loss or damage to livestock or personal property irrespective of the cause thereof.
Color
Black
Size
U3
Age Range Description
All Life Stages
Number of Items
1
Style
24 to 40 US Gallons
Specific Uses for Product
Indoor
Is Discontinued By Manufacturer
No
Product Dimensions
10.5 x 3.25 x 4 inches; 1.76 Pounds
Manufacturer recommended age
1 month and up
Best Sellers Rank
See Top 100 in Pet Supplies

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About This Review

Researched and written by the Review Atlas editorial team

How We Review This Product

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Our Research Process

  • We analyze the full manufacturer specifications and compare them against competing products
  • We synthesize verified customer feedback to surface recurring praise and complaints
  • We track pricing and availability so recommendations reflect real value at today's prices
  • Manufacturers cannot pay for placement, scores, or favorable coverage
  • Evaluated using our Aquariums & Fish Bowls review criteria
Last updated: November 17, 2025
Independent, reader-supported research