Using this Fluval activated carbon power filter insert is easy. Simply place it in your aquarium's filter system according to the system's instructions. It works well in both fresh and saltwater aquariums. As for maintenance, to keep your aquarium water in top - notch condition, replace the insert every 4 weeks. This ensures that the filter continues to remove odors, discolorations, and toxins effectively. Also, remember that this insert won't raise phosphate levels, so you don't have to worry about that aspect while maintaining your aquarium. Enjoy a healthy and clear aquarium environment with this filter insert.