Hagen Filtration Media Pack for Fluval U4 – Activated Carbon and Filter Floss

Hagen Filtration Media Pack for Fluval U4 – Activated Carbon and Filter Floss is a replacement media kit designed to fit Fluval U4 canister and compatible power filters. The pack contains activated carbon and filter floss (wadding) formulated to work together to remove dissolved organic compounds, discoloration and odors while providing mechanical capture of fine particles. This media pack is intended for routine maintenance and media replacement to help restore and maintain water clarity in freshwater and most planted aquarium setups.

Advantages

The activated carbon component adsorbs dissolved impurities that cause yellowing and unwanted odors, improving water appearance without affecting biological filtration. The filter floss provides a fine mechanical barrier that traps debris and suspended particles, preventing them from recirculating. Together, these media make media replacement quick and straightforward and are shaped to integrate into the Fluval U4 media baskets for consistent flow and filtration performance.

Suitable for

• Routine media replacement in Fluval U4 canister or compatible power filters
• Removing discoloration and mild organic staining from aquarium water
• Reducing odors and dissolved organics after medication or water changes
• Mechanical removal of fine debris and suspended particulates

Key specifications

• Media types: activated carbon and filter floss (wadding)
• Function: chemical adsorption and fine mechanical filtration
• Compatibility: designed for Fluval U4 filter models and compatible media baskets
• Intended use: routine media replacement and maintenance for freshwater aquaria

How to use

Turn off and unplug the filter before opening the unit. Remove the existing media from the Fluval U4 media baskets, rinse the new filter floss briefly with dechlorinated water if recommended by the manufacturer to remove dust, and place the floss into the designated media tray. Add the activated carbon in its compartment or media bag as specified for your filter model. Reassemble the media baskets and restart the filter, checking for proper flow and seals. Replace the activated carbon regularly according to aquarium conditions and manufacturer guidance to maintain adsorption efficiency.

Usage recommendations

Do not use activated carbon continuously if you rely on long-term medication or liquid additives that should remain in the water; remove carbon during treatments to avoid removing active ingredients. Replace filter floss when visibly clogged or during scheduled maintenance cycles to preserve flow and filtration efficiency.