Fluval Poly-max U3

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Specifically designed for the Fluval U3 filter, the U3 Poly-Max Cartridge helps control green water and unsightly algae growth by trapping and adsorbing phosphate, nitrite and nitr ate Chemical filter mediaProduces crystal clear water, reduces odor, and creates ideal conditions for fish and plantsHelps reduce overall aquarium maintenanceSuitable for freshwater, saltwater or reptile environmentsConvenient 2-pack format Show more