Carbon Cartridge for Fluval C4 Filter, 3 x 140 g – Fluval FV-0133

The Carbon Cartridge for Fluval C4 Filter, 3 x 140 g is a factory-shaped replacement media pack designed to fit Fluval C4 multi-stage canister filters. Each cartridge contains 140 g of activated carbon formulated to adsorb odors, discoloration and dissolved organic impurities from aquarium water, supporting clearer water and maintaining visual clarity between full media changes. The three-pack provides spare cartridges for routine maintenance and simplifies media replacement for freshwater and compatible aquaria.

Advantages

These pre-filled carbon cartridges are ready to install without the need to measure or bag loose carbon, ensuring a cleaner and more convenient service process. The activated carbon effectively removes unwanted color and odors while helping to reduce dissolved organics that can affect water transparency. Packaged as a set of three, the cartridges provide regular replacement intervals and reduce downtime during filter maintenance.

Suitable for

• Routine carbon replacement in Fluval C4 canister filters
• Removing discoloration and odors from freshwater aquaria
• Temporary polishing of water after medication or algae treatment
• Maintaining aesthetic water clarity between filter media overhauls

Key specifications

• Quantity: 3 cartridges per pack
• Carbon per cartridge: 140 g activated carbon
• Form: Pre-filled, replaceable cartridges designed for quick installation
• Compatibility: Designed for use with Fluval C4 multi-stage canister filters
• Function: Adsorbs dissolved organics, discoloration and odors

How to use

Shut off and disconnect the canister filter according to the filter manufacturer's instructions before opening. Remove the used carbon cartridge from the designated media basket and dispose of it in accordance with local waste regulations. Insert a new pre-filled cartridge into the same media slot, ensuring it sits securely and follows the flow direction indicated by the filter design. Reassemble the filter, re-prime if required, and restart the unit. Replace cartridges on a schedule consistent with aquarium load and water quality; inspect water clarity after each change.

Usage recommendations

For routine maintenance, replace carbon cartridges every 3–4 weeks or sooner after medication, heavy feeding or noticeable discoloration. Do not use activated carbon simultaneously with chemical additives that should remain in the water; remove carbon during chemical treatment periods to avoid unintended adsorption. Store unopened cartridges in a cool, dry place away from strong odors.