Eheim reeflex UV Steraliser UVC Bulb for 350, 500 or 800 Clarifiers & Biological Additives The Marine Hydrometer takes a

The Marine Hydrometer takes a true water sample at 15cm depth

Highest organic removal capacity

Kalkwasser solutions maintain calcium directly and carbonate alkalinity indirectly

Helps maintain long term health

Eheim reeflex UV Steraliser UVC Bulb for 350, 500 or 800 Clarifiers & Biological Additives The Marine Hydrometer takes aReplacement UV C Bulb for Eheim reeflex UV Steralisers 350, 500 or 800. The EHEIM reeflexUV clarifiers use UV C radiation to clean aquarium water in fresh and sea water aquariums and are operated in the filter system's water cycle (discharge side) or by using a separate circulation pump (not included). Please check your Reeflex Unit prior to purchasing to see which bulb type it takes, 2 or 4 prong. Aquarium water permanently flows through a glass tube