2 x Compatible Fluval U4 Polycarbon Filter Cartridges

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You are buying a pack of 2 compatible polycarbon filter cartridges to fit the Fluval U4 internal filter.These filter cartridges have a polyester side for mechanical filtration, and a carbon impregnated side for chemical filtration of the aquarium water.Regular replacement of the filter cartridges in your filter will ensure that your filter is running at its best. Show more