These lamps are specially manufactured for submergible germicidal lamps used in water or liquid. They are very easy to handle because they have a water-proof double-tube structure with the outside of a linear germicidal lamp sealed with quartz glass and a base is used in only one side. They are specifically designed for sterilization in water, and have special sizes and electrical characteristics. For sterilization of water (liquid), select appropriate germicidal lamps taking into account the nature of water, depth, flow rate, volume and type of microorganisms.