2 x Compatible Fluval U3 Polycarbon Filter Cartridges

You are buying a pack of 2 compatible polycarbon filter cartridges to fit the Fluval U3 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.