Fluval U4 Poly/Carbon Cartridge (2pk)
-Trap fine debris, improves water quality and removes odour
-Specially shaped to fit Fluval U4 filter
The Poly/Carbon filter cartridge features two sides: the Polyester filter pad side filters out fine debris and contaminants. The Carbon side filters out harmful liquid substances, colorants and odours.
-Replace every 2 to 4 weeks or when flow rate is noticeably reduced.
-Replace one at a time, never replace both at the same time.