Ocean Free

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.

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Showing 54 Products

  1. Ocean Free Cata-Pure Cartridge
    Ocean Free Cata-Pure Cartridge
    From £11.99
  2. suction cup set, for Ocean Free hydra
    Ocean Free Suction Cup Set