Aquarium filter media Hagen Aqua Clear carbon insert 300/70 (activated carbon cartridge)

Hagen Aqua Clear carbon insert 300/70 is an activated carbon cartridge designed as a direct replacement for Aqua Clear canister and power filters that accept the 300/70 size. The insert contains granular activated carbon formulated to adsorb dissolved organic compounds, remove discoloration and reduce unwanted odors in aquarium water. It is intended for routine maintenance to help restore water clarity in freshwater and planted aquariums without altering water chemistry when used as directed.

Advantages

The activated carbon media provides efficient adsorption of dissolved organics and tannins that cause yellowing and cloudiness. The sealed cartridge format simplifies handling and replacement, minimizing contact with the media. The product is pre-measured for the compatible filter size, ensuring consistent performance and easy installation. It is suitable for periodic use during regular maintenance to complement mechanical and biological filtration stages.

Suitable for

• Removal of discoloration and tannins in freshwater and planted tanks
• Reducing dissolved organics and mild aquarium odors
• Routine cartridge replacement in Aqua Clear filters sized for 300/70 inserts
• Short-term water clarification after medication, algae blooms, or decor staining

Key specifications

• Media type: activated carbon (granular)
• Form factor: sealed cartridge/insert sized for 300/70 filter bays
• Primary function: adsorption of dissolved organics, discoloration and odors
• Intended aquarium type: freshwater and planted setups
• Compatibility: designed for filter models that accept 300/70 cartridges

How to use

Turn off and unplug the filter before opening the filter housing. Remove the spent cartridge and dispose of it according to local waste regulations. Remove the new cartridge from its outer packaging and insert it into the filter compartment in the orientation specified by the filter manufacturer. Reassemble the filter, restore power, and confirm normal flow. Replace the carbon insert on a regular schedule or as needed when water clarity or odor control decreases. Do not rinse the cartridge under running water before use unless instructed by the filter manufacturer, as this may reduce effectiveness.

Usage recommendations

Use the carbon insert as part of a balanced maintenance routine: combine mechanical, biological and chemical filtration according to aquarium needs. Replace the carbon cartridge after the manufacturer’s recommended interval or sooner if water discoloration or odors reappear. Avoid continuous long-term use if medications are currently being applied, unless activated carbon is specifically recommended to remove residual active substances.