The OASE BioStyle Power Filter Phosphate Binder Cartridge can be used in place of the Biological Filter Foam in the OASE BioStyle Power Filters. It should be used when you need to remove cloudy water, harmful metals, odors, tannins or other colors for clear, pure aquarium water.

Activated carbon is processed to have small, low-volume pores that increase the surface area available for absorption of unwanted substances.

Carbon should be used only when needed and replaced after 3 to 4 weeks, depending upon aquarium size, number of fish and plants, and declines in filter performance.