Skimz PurSulpur media is made from the purest grade of sulphur for use in nitrate reactors. Sulphur is a food source for bacteria that eliminate nitrates by converting them to nitrogen gas. They have to be replaced from time to time as they are slowly consumed by the bacteria.
Caution: Use Skimz PurSulpur media in sulphur nitrate reactors having a low water flow rate. The water leaving the nitrate reactor has a low pH and can be dripped over calcium media to raise the pH before entering the aquarium.