Seachem Purigen®Highest organic removal capacity Possesses enhanced capacity owing to its vast surface area; both spherical and macroreticular Helps control ammonia nitrite nitrate Color changes as it exhausts; easily regenerated Overview 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