Bio-Foam+ Foam Blocks for Fluval 306/406 and 307/407 Filters, 2-pack

Specially designed for Fluval 306/406 and 307/407 external filters, Bio-Foam + foam blocks work doubly hard by acting as an effective filter medium for both mechanical and biological filtration.

Main features:

• Constitute a mechanical and biological filter medium;
• Contain a large porous surface that supports the expansive proliferation of beneficial (nitrifying) bacteria;
• Effectively trap small particles and debris, especially those not retained by the foam during the first stage of filtration;
• Are custom-fit specifically for 06 and 07 series filters to increase filtration efficiency;
• Help create a healthy aquatic environment and ideal water conditions;
• Should be rinsed every 3 months;
• Should be replaced every 6 months;
• Are available in a convenient 2-pack;
• Suitable for freshwater and saltwater aquariums.