The OASE BioStyle Power Filter Customizable Cartridge can be used in place of the Biological Filter Foam in the OASE BioStyle Power Filters. Add your choice or combination of dry, solid filter media into this empty cartridge based on your aquarium’s needs; filter media sold separately.

The customizable cartridge inner capacity is 120 mL with dimensions of 0.57 x 2.3 x 5.8 inches.

Timing to replace the cartridge depends on the media you put inside and depends upon aquarium size, number of fish and plants, and declines in filter performance.