Fluval Zeo-Carb Carbon Cartridge for C4 Filter, pack of 3 x 230 g

Fluval Zeo-Carb Carbon Cartridge for C4 Filter, pack of 3 x 230 g is a factory-shaped replacement media designed specifically for use with Fluval C4 canister filters. Each cartridge contains a blend of activated carbon and zeolite-based media formulated for chemical filtration and ammonia adsorption in freshwater aquariums. The media targets dissolved organics, discoloration and odors to help maintain clearer water and reduce maintenance frequency.

Advantages

The combined activated carbon and zeolite formulation provides both adsorption of organic compounds and removal of ammonia-related compounds without altering mechanical filtration. Cartridges are pre-filled and sized for direct installation into Fluval C4 filter media baskets, simplifying replacement and ensuring consistent performance. Packaging in a three-pack offers multiple change intervals for regular maintenance of freshwater aquariums.

Suitable for

• Freshwater aquariums using Fluval C4 canister filters
• Aquarium setups requiring removal of discoloration and dissolved organics
• Systems where ammonia adsorption is desired between water changes
• Routine maintenance cycles with periodic media replacement

Key specifications

• Pack contents: three pre-filled cartridges
• Individual cartridge weight: 230 g
• Media type: activated carbon combined with zeolite-based ammonia-adsorbing media
• Intended filtration function: chemical adsorption and ammonia reduction
• Compatibility: designed for Fluval C4 canister filter media baskets

How to use

Replace the existing carbon/zeolite cartridge in the Fluval C4 canister filter according to the manufacturer’s maintenance schedule or when water discoloration or odor becomes noticeable. Shut off and disconnect the filter following safety guidance, open the canister, remove the spent cartridge, and insert a new pre-filled cartridge in the same position. Reassemble the canister, reconnect and restart the filter, and check for proper operation and water flow. Dispose of used cartridges responsibly according to local regulations.

Usage recommendations

For ongoing chemical control, change cartridges at regular intervals recommended for your aquarium’s bioload and water quality; inspect water parameters and replace sooner if ammonia levels rise or discoloration returns. Do not use the cartridges as mechanical filter media—combine with appropriate mechanical and biological media to maintain balanced filtration.