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Safety Warning: Germicidal lamps emit UV-C radiation at 253.7nm that is dangerous to the human eye and skin. These lamps should NOT be used for general illumination and only used in a sealed filter unit or cannister Suitable Applications: Compatible with aquarium and fish pond filters, UV clarifiers and fully enclosed external canister UVC filters. For sterilisation purposes replace every 6 months. For clarification of ponds replace every 6-12 months UV Wavelength: 253.7nm UV wavelength for water clarification and sterilization applications in pond and aquarium systems Tube Measurement: 212mm excluding pins, 225mm including pins, diameter 16mm