Genuine Fluval replacement poly/carbon cartridges for the Fluval U range of internal filters - available for the U2, U3 and U4 filters.
Each pack contains 2 replacement cartridges designed to remove small particles, polish the water and improve clarity.
The Fluval Poly/Carbon Cartridges have two unique filtering sides that combine to provide thorough and effective chemical filtration, the crucial second stage in the filtration process. A polyester pad filters out fine debris and contaminants, the carbon side filters out harmful liquid substances and odours.
