Activated Carbon Cartridge for Fluval C3 Filter, 3 × 70 g

Replacement activated carbon cartridge set for the Fluval C3 external aquarium filter, supplied as three identical cartridges of 70 g each. These cartridges are intended for chemical filtration and are formulated to reduce dissolved organic compounds, remove odors and minimize minor discoloration in aquarium water. Designed for routine cartridge replacement, the set supports ongoing water clarity and complements mechanical and biological filtration in freshwater and planted aquaria.

Advantages

The activated carbon cartridges provide fast adsorption of organic waste and trace contaminants without altering the filter’s flow characteristics. Packaged as three ready-to-install units, they simplify maintenance and allow staged replacement to maintain continuous chemical filtration. The media is suitable for use in tanks where reduction of odors and water discoloration is required and does not introduce dyes or additives that could affect water chemistry when used as directed.

Suitable for

• Freshwater aquariums using the Fluval C3 external filter
• Planted tanks where temporary removal of dissolved organics is needed
• Routines of regular cartridge replacement to preserve water clarity

Key specifications

• Quantity: 3 cartridges per set
• Active media per cartridge: 70 g activated carbon
• Form: pre-filled, replaceable cartridge compatible with Fluval C3 filter
• Primary function: chemical adsorption of dissolved organics and odors

How to use

Turn off and unplug the Fluval C3 filter before opening the unit. Remove the used carbon cartridge and discard it according to local waste guidelines. Insert a new activated carbon cartridge into the designated media chamber, ensuring correct orientation and seating. Close the filter housing, reconnect power, and verify normal flow. Replace cartridges at manufacturer-recommended intervals or sooner if water discoloration or odors reappear; follow routine maintenance to avoid bypass of mechanical or biological media.

Usage recommendations

Use one cartridge at a time according to tank needs and replace regularly—typically every 2–4 weeks depending on bioload and water conditions. Avoid continuous long-term use when medicating fish, as carbon will remove treatment agents; remove carbon prior to medication and reinstall after treatment is complete.