The Fluval FX UVC 6-WATT In-Line Clarifier is a compact unit designed for aquariums up to 400 US gallons. Made by the trusted brand Fluval in Italy, this ultraviolet clarifier unit effectively eliminates harmful bacteria and microorganisms in the water, promoting a healthier environment for fish and other aquatic animals. With its sleek design and efficient 6-watt power, this clarifier is a reliable and efficient addition to any aquarium setup.