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Boyu Activated Carbon It is also known as activated charcoal, it is an essential filter media for every aquarium. It can effectively eliminate odors, detoxifies harmful metals, purifies and soften the water. First, rinse the activated carbon with water, then put it into the filter casing, it will start functioning immediately. Please take out the activated carbon from the filter while your fish is being treated medically. Refit back when fish is fully recovered. Should be replaced after 3 months.