Fluval Underwater Filter Poly/Carbon Cartridge, 2 count
By Fluval
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$8.99 Chewy Price
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$11.99 List Price
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3 Customer Questions
will this work for the 2.6 gallon tank? Or the 5 gallon tank? I have both.
Answer by • Mar 06, 2018
The Fluval Underwater U4 Filter and Cartridges are recommended for use in 34-65 Gallon tanks.
Will this work for Fluval canister filters 307 or 305?
Answer by • Aug 13, 2021
This filter cartridge is specifically designed for use in the Fluval Underwater Filter for Aquariums, Size U4.
What are the filter's dimentions?
Answer by • May 31, 2021
These filters measure approximately 6.7 x 2.8 x 1.8 inches.












