Fluval U4 Media Cartridge Set Complete Replacement

Keep your aquarium water clean, clear and healthy with the Fluval U4 Complete Filter Media Cartridge Kit. This replacement media set contains the complete range of filtration media used in the Fluval U4 Internal Filter, allowing you to refresh your filter's media and maintain effective filtration performance.

Designed specifically for the Fluval U4 Internal Aquarium Filter, this kit provides mechanical, biological and chemical filtration to help maintain excellent water quality and a healthy aquatic environment.

Key Features
Complete Filter Media Set – Includes the filtration media required for the Fluval U4 Internal Filter.
3-Stage Filtration – Supports mechanical, chemical and biological filtration.
Mechanical Filtration – Foam media traps dirt, debris and suspended particles from aquarium water.
Chemical Filtration – Activated carbon helps remove impurities, unwanted odours and discolouration.
Biological Filtration – BioMax media provides a surface for beneficial bacteria that help break down harmful ammonia and nitrite.
Genuine Fluval Media – Designed for use with the Fluval U4 Internal Filter.
Easy Maintenance – Replacement media helps keep your filter operating efficiently.

Complete Filtration System
The Fluval U4 uses a multi-stage filtration system to maintain aquarium water quality.
Stage 1 – Mechanical Filtration
Foam filtration media captures waste, uneaten food and other suspended debris, helping to keep aquarium water clear.
Stage 2 – Chemical Filtration
Activated carbon helps remove dissolved organic impurities, odours and discolouration, improving water clarity.
Stage 3 – Biological Filtration
Fluval BioMax provides a porous surface for beneficial bacteria to colonise, supporting the natural nitrogen cycle and helping convert harmful waste compounds into less toxic substances.

Compatibility
Fluval U4 Internal Aquarium Filter

Please Note: This listing is for the complete replacement filter media kit only. The Fluval U4 filter unit is not included.

Maintenance Advice
For best results, inspect and clean your filter media regularly using water removed from the aquarium during a water change. Avoid replacing all established biological media at the same time, as this can disrupt the beneficial bacteria responsible for biological filtration.
Regular maintenance and appropriate media replacement will help ensure your Fluval U4 continues to provide reliable filtration for your aquarium.