Coralife Turbo-Twist Ultraviolet Sterilizer removes free harmful micro organisms from aquarium water. This unit features a unique twist flow design that increases water's exposure to ultraviolet light improving the treatment of unwanted microorganisms. It includes mounting brackets for hang-on or in-line application for an easy setup and easy installation. There's a indicator light to let you know when the sterilizer is operating. Uses Coralife UV Replacement Lamps. A water pump is needed and not included with the Turbo-Twist. Available in multiple sizes to accommodate a variety of aquarium sizes. Coralife is a trusted brand of marine aquarium parts and supplies. We offer aquarium lighting, filtration products, marine salt mix and more. When aquarium systems require more than just the basics - Coralife steps in. From the all-inclusive BioCube aquariums to a complete range of lighting and equipment, the Coralife brand is designed to meet the needs of the more advanced aquatic hobbyist.