Ocean Free Hydra Cata-Pure Cartridge 4 Pack Native & Specialist “The folks at Seachem have

“The folks at Seachem have done a wonderful job responding to the needs of aquatic gardeners

It is a blended buffer which will target a pH of ~6

Selectivity: Purigen® is the highest capacity organic filtration resin on the market

this thermostatically controlled aquarium heater is suitable for freshwater or marine

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

Ocean Free Hydra Cata-Pure Cartridge 4 Pack Native & Specialist “The folks at Seachem haveThe 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