PetBlvd.com offers: Purigen is a premium synthetic adsorbent that is unlike any other filtration product. It is not a mixture of ion exchangers or adsorbents, but a unique macro-porous synthetic polymer that removes soluble and insoluble impurities from water at a rate and capacity that exceeds all others by over 500%. Purigen controls ammonia, nitrites and nitrates by removing nitrogenous organic waste that would otherwise release these harmful compounds. Purigens impact on trace elements is minimal. It significantly raises redox. It polishes water to unparalleled clarity. Purigen darkens progressively as it exhausts, and is easily renewed by treating with bleach. Purigen is designed for both marine and freshwater use. This product is sold by volume. Cited weight is minimal weight. DIRECTIONS: Rinse before use. Use in a fine mesh filter bag. Each 1 L treats up to 4,000L (1,000 gallons*) for up to six months. Exhaustion is indicated by a pronounced discoloration of the beads to dark br
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