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Seachem Purigen 100ml is a premium synthetic adsorbent that is unlike any other filter product. It is not a mixture of ion exchange resins or adsorbents, but a unique macroporous synthetic polymer that removes soluble and insoluble impurities from water at a rate and power that exceeds all other competing products by more than 500%. Purigen controls ammonia, nitrites and nitrates by removing nitrogenous organic waste that would otherwise release these harmful compounds. Purigen's effect on trace elements is minimal. It significantly increases oxidation-reduction processes. Purigen purifies water to unrivaled purity. It gradually darkens as it depletes and is easily renewed by bleaching. Purigen is designed for both freshwater and marine aquariums. This is part of the description of this product, the rest can be easily found on the Internet