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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 reviewsReal-World Testing
30 days of real-world testing
Recently Updated
Updated Nov 17, 2025
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 the Author
Expert analysis by Darius Novak
Darius Novak
Expert ReviewerAssociate Editor
In Prague, Darius tests meters, power tools, and safety gear for Review Atlas. He values standards compliance and spare‑parts access, helping pros and DIYers buy tools they can trust for years.
Industrial ScientificTools Home Improvement
View Full ProfileHow We Tested This Product
Our rigorous, independent testing process
Testing Period
30 days
Tested By
Darius Novak
Our Testing Process
- We purchase all products at full retail price to ensure unbiased testing
- Products are tested in real-world conditions matching everyday use
- Our experts conduct both objective measurements and subjective evaluations
- Reviews are regularly updated as new products enter the market
- Tested according to our Aquariums & Fish Bowls testing methodology
Last updated: November 17, 2025
|Independently tested and reviewed