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This is a 3 pack of Fluval Carbon Packs (14013) for the Fluval C4 Aquarium Filter System (14003). These Fluval activated carbon filter packs are used as the Stage 3 chemical filter media in the Fluval C4 Aquarium Power Filter System.
These Fluval carbon filter replacements for the Fluval C4 Aquarium Filter use activated carbon to absorb unwanted odors, discolorations, and other impurities. Fluval carbon filters further reduce the amount of particulate matter in your aquarium to help your aquatic pets thrive better. They also reduce any remaining trace amounts of chlorine and improve water clarity.
Fluval C4 carbon packs should be changed approximately every 2-4 weeks to better maintain water quality. These Fluval activated carbon replacement filter packs are also known by Hagen part number 14013. They can be used in both freshwater and marine aquariums.