Purigen is a synthetic adsorbent. Ultimate Filtering Unparalleled organic waste removal capacity. Navy & Freshwater. High quality synthetic adsorbent for water filtration. It is not a blend of ion exchangers or adsorbents, but a unique macroporous synthetic polymer that removes soluble and insoluble contaminants from water at a rate and capacity that exceeds all others by more than 500%. Purigen controls ammonia, nitrite and nitrates by removing nitrogen-rich organic waste that otherwise releases these harmful compounds. Purigen's impact on trace elements is minimal. It significantly increases the redox. It ensures incomparably clear water. Purigen gradually darkens as it skims and is easily renewed by treatment with bleach. Purigen is suitable for both sea and fresh water.