Mechanical and Biological filteration.

Foam cartridge for Powerhead.

Ideal for Bio 50 and Bio 250 Filters, open cell design.

Superior 'Dry' Chamber Bacteria colonization nodes.

Provides final removal of debris & spreads water evenly into biological chamber.

Fine polyester to eliminate fine particles for crystal clear water.

Dual Foam Inserts effectively remove large and medium particles.

Added 'Wet' chamber bacterial attachment nodes. Stage 5.

A complete internal filter of remarkably small size.