Bio-Foam filter foam blocks for Fluval FX4/FX5/FX6 filters, 3-pack

Specially designed for Fluval FX4, FX5 and FX6 high-performance external filters, Bio-Foam filter blocks ensure effective mechanical filtration by trapping large particles and debris.

Key Features:

• Provide mechanical filtration;
• Effectively trap most waste and debris;
• Include a complex foam structure that maintains uniform water flow and naturally promotes the growth of beneficial bacteria;
• Are custom-fitted to prevent debris from passing through;
• Enhance the biological filtration process;
• Are available in a convenient 3-pack;
• Should be replaced every 6 months;
• Suitable for fresh and saltwater aquariums.