SHIRUBA Activated Carbon Cartridge Replacement (PF Hang On Back Filter (2pcs/box))

SHIRUBA Activated Carbon Cartridge Replacements for PF Filters PF60, PF120, PF240, PF360, PF800, PF1000. 2 filter cartridges per packet. Cartridges contain activated carbon for toxin and pollutants removal. NOTE It is advised to change your activated carbon cartridges at least once a week for an aquarium with high bioload. Do not use activated carbon cartridges while treating an aquarium with medication