You can, but it does not leave any residual ability for the water to neutralize pathogens once you're done treating the water.
If you dip a Nalgene bottle to fill it, then purify the contents, you would typically then bleed the threads by holding the bottle upside down and loosening the cap.
With chemical treatment, the iodine in the water works to neutralize any pathogens that aren't flushed out of the threads. If you've used UV, you're kind of hoping that the flushing action has physically washed out anything lingering in the threads.
Anecdotally, people using UV get more cases of waterborne illness, but I don't know if anyone has rigorously studied this. Hikers are naturally resistant to controlled experiments.
If you don't like the flavor of iodine tablets, I recommend AquaMira instead.
Source: AT ME-MA 2003, GA-ME 2010. UV was pretty popular by 2010 and for a couple years after. Not planning a thru hike at the moment, but I believe the Sawyer squeeze filter is super popular now.
If you dip a Nalgene bottle to fill it, then purify the contents, you would typically then bleed the threads by holding the bottle upside down and loosening the cap.
With chemical treatment, the iodine in the water works to neutralize any pathogens that aren't flushed out of the threads. If you've used UV, you're kind of hoping that the flushing action has physically washed out anything lingering in the threads.
Anecdotally, people using UV get more cases of waterborne illness, but I don't know if anyone has rigorously studied this. Hikers are naturally resistant to controlled experiments.
If you don't like the flavor of iodine tablets, I recommend AquaMira instead.
Source: AT ME-MA 2003, GA-ME 2010. UV was pretty popular by 2010 and for a couple years after. Not planning a thru hike at the moment, but I believe the Sawyer squeeze filter is super popular now.