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It is made of crushed natural material that is highly absorptive of detrimental substances such as ammonia and chlorine. It is one of the most powerful absorbers of ammonia. It can help to keep the nitrate value from rising. By removing these contaminants, it prevents the aquarium/pond from bacterial and algal growth, which in turn prevents the aquarium/pond from stinking, reduces the chance of aquatic disease, raises oxygen content and increases breeding density. It also removes toxic hydrogen sulfide produced by stale water. It can prolong the cleaning interval of an aquarium by more tha 6 months while keeping the water quality stable,. Besides it has ion-exchange capabilities that will exchange harmful heavy metal ions with harmless ions.