Light cleaning may be required. It is not a defect, rather it is a natural process that occurs with age. Listed BGCL.
SteriPEN - Traveler Water Purifier Traveler 3-in-1 Handheld UV Brand New
SteriPEN Traveler UV water purifier
SteriPEN Adventurer Opti Handheld UV Water Purifier with solar charging case
SteriPEN Handheld UV Water Purifier Outdoor Emergency NOS
SteriPEN Handheld UV Water Purifier Outdoor Emergency Travel open box
KATADYN Steripen Adventurer Opti UV Water Purifier Backpacking Camping Travel
