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Seachem Purigen is a synthetic polymer filter media that removes soluble and insoluble organic waste from freshwater and marine tanks. It targets the nitrogenous organics that break down into ammonia, nitrite and nitrate, and it polishes water to a clear, colorless look. It is reusable: it darkens as it exhausts and is renewed with a bleach soak. Unlike carbon and ion-exchange resins, it leaves trace elements largely alone and raises redox. It suits keepers who want clearer water and lower organic load, but it is not a substitute for biological filtration or water changes.
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Lowest price we've seen: $9.89 on Nov 13 at Amazon. Tracked across 10 stores since Nov 13.
Owners rate it very highly and most praise the water clarity and the rechargeable design. Complaints center on the rinse and bleach routine and on how quickly it exhausts in dirty tanks.
Purigen is a synthetic adsorbent for aquarium filtration. It is a single macro-porous synthetic polymer, not a mixture of ion exchangers or adsorbents. It removes both soluble and insoluble impurities from the water and is designed for marine and freshwater use.
It controls ammonia, nitrites and nitrates by removing the nitrogenous organic waste that would otherwise release them. Its impact on trace elements is minimal. It significantly raises redox and polishes water to a high level of clarity.
Purigen darkens progressively as it exhausts. It can be renewed by treating it with bleach.
