VIQUA UV Replacement Lamp to Keep Your Water Protection Working A UV system only works as well as its lamp, and lamps wear out even when they still glow. This VIQUA UV lamp is a long, slim quartz tube with a four-pin base on one end and a white cap on the other. Over time the light loses its germ-killing strength, so most makers suggest swapping it about once a year. Fitting the right model matters, so match the part number to your unit before ordering. Unplug the system, handle the new lamp by its ends, and slide it in. A fresh lamp keeps your water treatment running the way it should. Visit : https://store.afwfilters.com/brands/viqua.html