Fluval C4 Activated Carbon Filter Media, 3 count

Skip image gallery
Slide 1 of 3

$7.79 First Time Autoship Price
this order
Save 35% (up to $20) today when you set up Autoship. 
$11.39 Autoship Price
(-5%) future orders
  • Keep saving 5% on every order
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$11.99 Chewy Price
($4.00 /ea)
Save $1.00 (-8%)
$12.99 List Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME
In Stock
FREE 1-3 day delivery on first-time orders over $35
Free 365-day returns

No interest if paid in full in 6 months on PayPal purchases of $149+. .

About This Item

Details

  • Filter media improves water clarity for a clearer, less cloudy tank and better water quality.
  • Chemical filter media eliminates odors, discoloration, and impurities.
  • Helps to eliminate most liquefied impurities, odors, and dyes for a healthy, clean aquarium.
  • Suitable for freshwater and marine aquariums.
  • Exclusively designed for Fluval C4 Power Filter (sold separately).

Instructions

FAQ

Learn More About Fluval From Our Team of Experts

Frequently bought together

Questions & Answers

3 Customer Questions

how big is the filter

Answer by Chewy • Dec 21, 2018
These filters measure 6 inches long x 5/8 inch wide x 6.5 inches tall.

How often should the carbon filter media be replaced?

Answer by Chewy • Mar 17, 2021
It is recommended to change the carbon the filter bi-weekly. It's better (and easier) to prevent odors versus having to remove them once they've accumulated. Some fish are messy eaters, or are more prone to producing large amounts of waste, so prevention is key.

What gallon size tank are these bags for?

Answer by Chewy • Feb 24, 2020
This filter media is intended to be used in the Fluval C4 Power Filter, which is designed for aquariums between 40 and 70 gallons.
Reviews
Write a Review
4.8
Rated 4.8 out of 5 stars
30 Ratings
Terms & Conditions

10 Customer Reviews

Rated 5 out of 5 stars
By Jeff on Dec 26, 2025

Takes care of odor

Had one of my 30 gallon aquarium had a smell to it, put in a fresh activated carbon and within a few days it was gone.

Had one of my 30 gallon aquarium had a smell to it, put in a fresh activated carbon and within a few days it was gone.

Rated 5 out of 5 stars
By Geneva on Aug 12, 2025

Rapid Response

The entire order got to my front door in just 4 days from ordering! Impressive, as always. Your shipping speed is phenomenal!

The entire order got to my front door in just 4 days from ordering! Impressive, as always. Your shipping speed is phenomenal!

Rated 5 out of 5 stars
By Steve on Feb 7, 2025

Ease in ordering

Does the job needed

Does the job needed

Rated 5 out of 5 stars
By Dr on Sep 22, 2024

Space EKO 300

Works very well with this filter.

Works very well with this filter.

Rated 5 out of 5 stars
By Larence on Dec 22, 2024

Works

Cleared tank up

Cleared tank up

Rated 5 out of 5 stars
By anguianod6 on Mar 13, 2019

GREAT filters

These filters work well for my turtle! Will be re-buying from chewy every time I need more!

These filters work well for my turtle! Will be re-buying from chewy every time I need more!

Rated 4 out of 5 stars
By Christy on Jul 29, 2018
Top 1000 Contibutor

I bought in bulk

I was totally unaware there were size differences & got these instead of the small ones my tank uses But being inventive I turned 3 of these into 9 for my little

I was totally unaware there were size differences & got these instead of the small ones my tank uses But being inventive I turned 3 of these into 9 for my little tank!! My mistake was a lucky thing!

Rated 5 out of 5 stars
By Joshua on Apr 29, 2017

Best design

I love this carbon pack! It is SO easy to change the media out with the basket design. I no longer have to take the entire filter apart to change 1 item. This

I love this carbon pack! It is SO easy to change the media out with the basket design. I no longer have to take the entire filter apart to change 1 item. This still needs to be rinsed well as alot of black carbon dust is still present.

Rated 5 out of 5 stars
By sfletch93 on Nov 3, 2016

Great Deal!

Fluval is a great brand, and this is the best price I've seen anywhere for these refills. Got them to freshen up the Fluval canister filter I use on my 46-g turtle

Fluval is a great brand, and this is the best price I've seen anywhere for these refills. Got them to freshen up the Fluval canister filter I use on my 46-g turtle tank. :)

Rated 5 out of 5 stars
By BT1234 on Aug 6, 2016

Great!

Better price than Amazon, and shipping was free! Thanks!

Better price than Amazon, and shipping was free! Thanks!