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Made with crushed natural material that is highly absorptive of detrimental substances such as ammonia and absorbers of ammonia and chlorine.
Note: Always rinse before use!

In fact, ammonia-absorbing stone is one of the most powerful absorbers of ammonia. It can also help keep the nitrate valve from rising. By removing these contaminants, it prevents the aquarium from bacterial and algal overgrowth, which in turn prevents the aquarium from stinking, reduces the chance of aquatic disease, raises oxygen content, and increases breeding density. Ammonia-absorbing stone also removes toxic hydrogen sulfide produced by stale water. It can prolong the cleaning interval of an aquarium by more than six months, while keeping the water quality stable. Also the stone has ion-exchange capabilities that will exchange harmful heavy metal ions with harmless ions. By using ammonia-absorbing stone, water clarity will be improved remarkably.