Ocean Free Hydra 30 Internal Filter 600L/H Suitable for aquariums between 100-200 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 Rectangular Cata-Pure Cartridge for Hydra 30 The Cata-Pure Cartridge can last 9-12 months depending on the amount of fish and is functional in marine environments.

Ocean Free Hydra 30 Impeller Replacement Impeller Shaft Ocean Free Hydra 30 Internal Filter

Ocean Free Hydra 30 Ceramic Impeller Shaft Replacement Ceramic Impeller Shaft for Ocean Free Hydra 30 Internal Filter Impeller sold separately.

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