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3 different media supplied with mesh bags including premium activated Carbon pellets, Zeolite ammonia remover & Supreme Biological rocks.Place bags in area of high flow, ideally in filter compartments or canister filters / sump.Amount supplied is sufficient for upto approx 200L aquarium. The bio rocks can be left indefinately to provide home for beneficial bacteria. Amount of bio rocks supplied is designed to supplement existing mature biological media. The Ideal upgrade pack for existing external/canister filter! will help to reduce algae issues and keep water crystal clear