•For mid or big fish tank
•It is water proof
•Super For continue cleaning for water-ultraviolet sterilization
•Algae removal + deodorant
•If you set another timer, you can set a timer (3 / 6 / 12 / 24 hours for UV activity) when you need it.
•UV light barrier to prevent UV light radiation to hurt fish
•8000 hours long life for UV light
•The best working time for normal tank is 2-3 hours per day (please work with more hours to solve heavy green dirty water tank)