Ocean Free Hydra Cata-Pure Cartridge 4 Pack Native & Specialist It skims off the film

It skims off the film residue and constantly brings new layers of water to the surface

Iodine is as toxic as chlorine and should never be used in a reef system

a highly porous ceramic filter medium that optimizes biological filtration for a healthy aquarium

FX Series Pump Unit (Motor) & Power Cord is suitable for FX5 and FX6 high performance filters (A218

Ocean Free Hydra Cata-Pure Cartridge 4 Pack Native & Specialist It skims off the filmThe Cata Pure Cartridge can last 9 12 months depending on the amount of fish and is functional in marine environments. Fits all model Hydra Internal Filters, Hydra Filtron & Inline Stream units which take the square cartridge. *HYDRA 30 NOTE: For the rectangular cartridge for the Hydra 30, click here. Please check your cartridge before purchase. The older model Hydra 30 have a rectangular cartridge, newer have the square. Model Number of Cata Pure