Coconut Shell Charcoal Media Bags For Aquarium PACKING: 0.9 LB coconut shell charcoal and 3 encrypted nylon bags STRONG POINTS: To improve the performance of the activated charcoal, we chose to increase costs by selecting high-quality coconut shells, free of heavy metals and pollutants. Absorb impurities through the oversized contact surface, purify the water, and improve the transparency of the tank and the living environment of the fish. USAGE SCENARIOS: Home aquariums, aquariums, or other places where water purification is required. CAUTION: Do not mix with other medications and use with caution in the presence of live plants; replace every 4 weeks for best results. For questions about our filter media, please contact us and we'll be happy to help