AQUAPAPA 6 lbs Bulk Activated Carbon Charcoal Pellets for Aquarium Fish Tank Koi Reef Filter Removes odor, colors, organic pollutants to keep water crystal clear; removes toxic compounds from fish tank. Phosphate free. Safe for both fresh and saltwater tanks. Fast working and long lasting. ** Note: Always rinse carbon media through until the water runs clear before use. ** Package includes: 6 lbs activated carbon in bulk. Bonus: 1 free mesh bag