These specialist filter cartridges from Fluval are designed to fit directly into the Fluval U Series filters, and help to add an extra layer of filtration within your aquarium, be it Freshwater or Marine.

It combines two unique sides, one of carbon to bring effective chemical filtration and the other of polyester to add an extra fine layer to remove even smaller particles. They come with 2 in each pack and should be replaced every 2 – 4 weeks, to ensure they are kept at their most effective. They can be changed sooner if there is a noticeable reduction in flow, such as after a big move around within the tank, resulting in a lot of particles, as the polyester pad will clog up sooner.