FX4 / FX5 / FX6 Compatible Circular Activated Carbon Filter! This activated carbon filter is custom-made for the FX4 / FX5 / FX6 high-efficiency filtration system, delivering outstanding water purification results for your aquarium. We understand the significance of clear water quality for the health of aquatic life, which is why we bring you this high-performance activated carbon filter, ensuring your aquarium water remains crystal-clear. Activated carbon serves as an exceptional adsorbent, effectively capturing harmful substances, odors, and impurities, including chlorine, ammonia, and organic pollutants from the water. These filters are crafted using high-quality renewable activated carbon materials, ensuring durability and sustainability, reducing the need for frequent replacements. The circular design of these filters optimizes space utilization within the filter, boosting filtration efficiency and ensuring thorough purification of the water. Replacing the filters is a straightforward task with the convenient plug-and-play design, saving you time and effort in maintaining your aquarium's water quality. Don't let water quality issues affect your aquatic paradise; choose the FX4 / FX5 / FX6 Compatible Circular Activated Carbon Filter, and ensure your aquarium always maintains a crystal-clear appearance.