You are purchasing one unit of the PURA - UV20 Water Treatment Germicidal UV Light Bulb 17.16" 10,000 Hours UV-20 10,000 Hour Long Life Lamp 25 Watts UV Hot Cathode Germicidal UV Bulbs (UV-C), are low-pressure mercury arc lamps that are the most effective tool for eliminating microorganisms such as virus, bacteria, mold and yeast in the air and impurities in water. Produces UV-C (253.7 nm wavelength) radiation (harmful to eyes and skin).
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