The Aquael Mini UV Sterilizer eliminates algae and other pathogenic microorganisms and helps to prevent fish diseases. The AQUAEL MINI UV LED sterilizer is in the form of a short sleeve that is placed over the filter outlet nozzle. There are four energy-saving LED diodes inside the sterilizer that emit UV light. The AQUAEL MINI UV LED sterilizer is compatible with the lines of AQUAEL internal filters: Fan Filter, Turbo Filter, and the Pat Mini. AQUAEL MINI UV LED aquarium sterilizers remove algae from the water, which prevents it from turning green, kills pathogenic bacteria, protects fish against diseases and destroys protozoa that cause water turbidity.