The Fluval UVC In-Line Clarifier is an efficient and compact solution designed to maintain a crystal-clear aquarium by eliminating suspended bacteria and algae that cause cloudy or green water. Using Fluval's Cold Cathode Fluorescent Lamp (CCFL) technology, this clarifier delivers powerful, DNA-destroying UVC light emissions, helping keep your aquarium water clean without the use of chemicals or affecting beneficial bacterial colonies.Key Features: --Chemical-Free Water Clarification: Provides a maintenance-free and chemical-free method to clarify water, ensuring the natural balance of your aquarium is preserved. --Prevents Cloudy & Green Water: Effective.