Ocean Free

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  1. Ocean Free Cata-Pure Cartridge
    Ocean Free Cata-Pure Cartridge
    From £11.99

Hydra is a unique brand, known for its use of electrolysis in aquarium filtration to remove ammonia and nitrite much quicker than traditional biological filters. Available in a large range of sizes and in internal and external units, the Hydra units by Ocean Free are really changing fishkeeping and reducing the exposure of harmful ammonia and nitrite to fish in aquariums.