The UV-C Clarifier is fully submersible (IP68 rated) and can be placed directly in a pond or aquarium sump. For added safety, it includes a built-in switch that automatically deactivates the UV-C lamp during maintenance.Key Features & Important Notes: Device features a compact size that is perfect for use in freshwater aquariums. Versatile application: fully submersible or installed in-line. Includes a safety switch for deactivating lamps during maintenance. Quickly connects in-line to most pumps and canister filters with included barb fittings. Product Specifications: 7W UV-C Clarifier Dimensions: 11.4" L X 4.15" W Suggested aquarium size: 25-100G Suggested flow rate: 50-130 GPH Hose Fittings: 1/2" / 3/4" / 1" Cable: 3 m / 10 ft 9W UV-C Clarifier Dimensions: 11.4" L X 4.15" W Suggested tank size: 50-150G Suggested flow rate: 100-200 GPH Hose Fittings: 1/2" / 3/4" / 1" Cable: 3 m / 10 ft 13W UV-C Clarifier Dimensions: 11.4" L X 4.15" W Suggested aquarium size: 80-250G Suggested flow rate: 150-400 GPH Hose Fittings: 1/2" / 3/4" / 1" Cable: 3 m / 10 ft