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Seachem Purigen is a synthetic polymer filter media that removes soluble and insoluble organic waste from aquarium water. It controls ammonia, nitrite and nitrate by pulling out the nitrogenous organics that would break down into them, and it polishes water to a clarity many owners describe as unmatched. It works in both freshwater and saltwater tanks and darkens as it exhausts, then is renewed with a bleach soak rather than replaced. Compared with carbon and ion-exchange resins, it targets organics more selectively and leaves trace elements largely alone, though it needs a fine filter bag and careful rinsing before use.
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Lowest price we've seen: $7.91 on Nov 13 at PetSmart. Tracked across 15 stores since Nov 13.
Owners rate it highly, with most praise going to water clarity and to how well it holds nitrate and organic levels down. Complaints center on the fine dust it releases if not rinsed and on how quickly it darkens in heavily stocked tanks.
Purigen is a synthetic adsorbent for aquarium water filtration. It is a macro-porous synthetic polymer, not a mixture of ion exchangers or adsorbents. It removes both soluble and insoluble impurities from the water.
Purigen controls ammonia, nitrites and nitrates by removing nitrogenous organic waste that would otherwise release these compounds. Its impact on trace elements is minimal. It raises redox significantly and polishes the water to a high level of clarity.
The media darkens progressively as it becomes exhausted. It can be renewed by treating it with bleach. It is designed for both marine and freshwater aquariums.
