Replacement Poly and Carbon Filter Cartridge for Fluval U3 Underwater Filter
Part number A-491
Designed specifically for the U3 filer model, the Fluval Poly/Carbon Cartridges features two sides for effective chemical filtration, the crucial second stage in the filtration process. The polyester filter pad side filters out
fine debris and contaminants. The Carbon side filters out harmful liquid substances, colorants
and odors. For freshwater, marine or reptile environments.