Fluval Underwater Filter Poly/Carbon Cartridge, 2 count

By Fluval
Rated 3.8571 out of 5 stars
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Fluval Underwater Filter Poly/Carbon Cartridge, 2 count slide 1 of 3
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Fluval Underwater Filter Poly/Carbon Cartridge, 2 count slide 1 of 3
$10.49Chewy Price

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About This Item

  • Helps eliminate harmful contaminants and keeps your fish safe.
  • One side features a polyester filter pad that removes fine debris and contaminants.
  • The other side contains carbon to remove dangerous contaminants along with unwelcome colorants and odors.
  • Specifically designed for use in the Fluval Underwater Filter for Aquariums, Size U4.
  • Ships in a pack of two cartridges; suitable for use in freshwater, marine or reptile environments.
Play Video: Learn More About Fluval From Our Team of Experts
Learn More About Fluval From Our Team of Experts

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Ensure your system runs smoothly with this Fluval Underwater Filter.


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MaterialPlasticMicrofiber, Synthetic FabricMicrofiber, Synthetic FabricPlasticPlastic

Questions & Answers

5 Customer Questions


will this work for the 2.6 gallon tank? Or the 5 gallon tank? I have both.
Answer by ChewyMar 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 ChewyAug 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 ChewyMay 31, 2021
These filters measure approximately 6.7 x 2.8 x 1.8 inches.

How do you use
Answer by ChewyOct 02, 2017
This product eliminates harmful contaminants and keeps your fish safe. One side features a polyester filter pad that removes fine debris and contaminants.This cartridge is compatible with the Fluval Underwater Filter for Aquariums U4 system. The item number is 103943.


ReviewsWrite a Review

3.9
Rated 3.8571 out of 5 stars
7 Reviews
71%
Would recommend to a friend
1
28.5714
29%
2
0
0%
3
0
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5
71.4286
71%

7 Customer Reviews



Rated 1 out of 5 stars
By Brett on Jul 17, 2021

Misleading

Bought this due to it recommending it as a compatible filter for rf-s top fin product and it is completely WRONG. Why are filters impossible to locate or fit in my tank?!


Rated 5 out of 5 stars
By Kelli on Mar 31, 2019

They actually filter..

Massive turtle poo. Not sure what else is needed. These go with my Fluval F4 and that’s all I got to say about that..............


Rated 5 out of 5 stars
By BFFs on Apr 22, 2019

Only the Best for the Turtles

I use fluval products for my underwater filter systems they are great!


Rated 1 out of 5 stars
By Lucky on Jul 22, 2018

stay away waste of money

WATER IS GREEN AFTER 4 DAYS, I changed 3/4 of water and again in four days I could barely see my fish. never had this problem before using this system. Wasted my money and my time with this product. My service from Chewy was GREAT ,just a bad choice from Fluval!!!!


Rated 5 out of 5 stars
By yeet on Aug 6, 2018

works great

great price for an amazing product, i use this in my res turtle tank and it keeps the water crystal clear


Rated 5 out of 5 stars
By Kellie on Nov 20, 2017

Great product great company! Ready to order again.

This protest is great and greater still is Chewy.com. Getting ready to order again!!!


Rated 5 out of 5 stars
By tortuga on Jul 29, 2017

be careful when ordering your Fluval filter!

There are two, one with carbon, another with just charcoal. This one works very well, but the other one does not work well at all in my experience. With the other one, my turtle tank water got murky after two days. With this one it has been crystal clear for two weeks now.