Ocean Free Hydra 50 Internal Filter 1000L/H Suitable for aquariums between 500-800 litres Features Hydra internal power filter. Effectively controls nitrite and nitrate by eliminating ammonia with groundbreaking Hydro-Pure technology. Flow Rate :...

Ocean Free Square Cata-Pure Cartridge for Hydra 20/30/40/50 (4pk) The 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 &...

Ocean Free Square Cata-Pure Cartridge for Hydra 20/30/40/50 (1pk) The 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 &...

Ocean Free Hydra 50 Impeller Shaft Replacement Impeller Shaft for Ocean Free Hydra 50 Internal Filter Impeller sold separately.

Ocean Free Hydra 50 Impeller Replacement Impeller Shaft Ocean Free Hydra 50 Internal Filter

Ocean Free Hydra 50 Superior Bio Foam Replacement Superior Bio Foam for the Hydra 50 Internal filters.

Ocean Free Hydra 20/30/40/50 Suction Cup Plates (2pk) Ocean Free suction cups and plate for Hydra 20/30/40/50 internal filter

Ocean Free Hydra 40/50 Suction Cup Plates (2pk) Ocean Free suction cups and plate for Hydra 40/50 internal filter