The Pura 36002018 UV lamp should be replaced every 12 months (annually), regardless of whether it appears to still be glowing. Over time, the UV-C output degrades and the lamp loses its ability to effectively disinfect water, even though it may still emit visible light. Replacing it yearly ensures your Pura UV20 system continues to deliver reliable microbiological protection against bacteria, viruses, and cysts.

The Pura 36002018 UV lamp is specifically designed as a genuine OEM replacement for the Pura UV20 series UV disinfection systems, including the UV20-1, UV20-2, and UV20-3 models. It is not interchangeable with Pura UV10 or larger UVBB systems. Always confirm your system model before ordering to ensure correct fitment and proper UV dosage performance.

The Pura 36002018 lamp emits germicidal UV-C light at 254 nanometers, the optimal wavelength for disrupting the DNA of microorganisms such as E. coli, Giardia, Cryptosporidium, and viruses. At the Pura UV20's rated flow rate, the lamp delivers a UV dose sufficient to inactivate up to 99.99% of waterborne pathogens, providing chemical-free disinfection for your household water supply.

The quartz sleeve does not need to be replaced every time you change the 36002018 lamp, but it should be inspected and cleaned annually during lamp replacement. Mineral scale or film on the sleeve blocks UV-C transmission and reduces disinfection effectiveness. Wipe the sleeve with a vinegar solution or soft cloth, and replace it if cracked, cloudy, or etched to maintain full UV performance in your Pura UV20 system.

To replace the lamp, first unplug the Pura UV20 ballast and allow the lamp to cool for several minutes. Shut off the water supply and depressurize the system. Remove the lamp connector, carefully slide the old lamp out of the quartz sleeve, and insert the new 36002018 lamp without touching the glass with bare hands — skin oils can create hot spots and shorten lamp life. Use clean gloves or a cloth, reconnect the lamp socket, restore power, and reset the annual replacement timer.