Activated carbon : Filter media

Activated charcoal is used in the filter of your aquarium. What is it used for? When to change or replace it? Is activated charcoal really essential? How is it composed? ...
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Lepoissonrouge, it's a channel about aquarium, presented by Annie who shares her knowledge, tips, and advice. The idea is to offer you neat and informative videos, with a true homemade tone.