4 x Compatible Fluval U4 Polycarbon Filter Cartridges

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You are buying a pack of 4 compatible polycarbon filter cartridges to fit the Fluval U4 internal filter. These filter cartridges have a polyester side for mechanical filtration, an d 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. Size (mm): 235 x 62 x 16 Show more