Fluval C4 Activated Carbon Filter Media, slide 1 of 1

Fluval C4 Activated Carbon Filter Media, 3 count

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Remove impurities and dyes from your aquarium with Fluval C4 Activated Carbon Filter Media. Fish waste, food and other organic matter can cause odors and discoloration in your aquarium which can lower water quality. Fluval C4 Activated Carbon Filter Media eliminates most liquefied impurities, odors, dyes for a healthy, clean aquarium. It is suitable for freshwater and marine aquariums and is exclusively designed for Fluval C4 Power Filter.

Key Benefits
  • Chemical filter media elimates eliminates odors, discoloration, and impurities.
  • Improves water clarity for a clearer, less cloudy tank.
  • For both freshwater and marine aquariums.
  • Provides superior adsorption qualities.
  • Helps keep water quality pristine for healthy tanks and thriving fish.

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  • Item Number
  • Aquarium Type
    Freshwater, Saltwater
  • Fish Type
    Tropical Freshwater, Marine Fish
  • Material

Remove protective plastic bag and rinse carbon insert thoroughly before use. Place insert into chemical media basket. To maintain water quality, it is important to replace insert every 2 - 4 weeks. To ensure constant presence of beneficial bacteria, do not replace all filtration media at the same time.


I change the carbon in my filter bi-weekly. Is this too often if I have a small fish load?

No, it is 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.

Does Fluval carbon filter media remove the liquid plant fertilizer I apply to my aquarium?

Carbon, especially when new, can remove some trace elements present in many liquid plant supplements. We recommend waiting at least a week or two after having changed the carbon before you apply a liquid plant supplement.

What material is Fluval Activated Carbon made from?

Fluval Carbon is made from bituminous coal, which is the best overall source material for carbon used for aquarium water filtration due to its varying pore structure and sizing.

Rating: 4.8 of 5 stars 5 Reviews 5 Reviews 4.8 out of 5 Stars

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Rating: 4.8 of 5 stars 4.8 / 5

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  • 5 out of 5 stars

    GREAT filters

    By anguianod6 on Mar 13, 2019

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

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  • 4 out of 5 stars

    I bought in bulk

    By Wormzzz on Jul 29, 2018 top1000Contributor

    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!

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  • 5 out of 5 stars

    Best design

    By josh on Apr 29, 2017

    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.

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  • 5 out of 5 stars

    Great Deal!

    By sfletch93 on Nov 3, 2016

    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. :)

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  • 5 out of 5 stars


    By BT1234 on Aug 6, 2016

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

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