UV-P11W Water Disinfection System with Ultraviolet Radiation UV Lamp. Ultraviolet radiation was discovered about 200 years ago. After years of experiments and research, science confirms that it is an excellent way to eliminate viruses and bacteria. Ultraviolet radiation is divided into 3 waves, A, B, and C waves. The 240-260nm of the C wave is the most effective with the strongest point at 253.7nm. The Aqua Pure UV Lamp prevents the growth of bacteria by destroying their DNA nucleus, making reproduction impossible. This technology is highly effective in combating bacteria, as well as many resistant pathogenic microorganisms. Some examples include E. Coli, Legionella, Salmonella, Hepatitis, Poliovirus, etc.