The UV-C LED in the cap shines into the bottle for 60 seconds when you tap the lid, and automatically every 2 hours. It is a convenience feature for everyday drinking water, not a water filter or purifier.
Can I use it with any water source?
Use it with drinking water: tap, filtered or bottled. It does not filter or treat water from rivers, lakes or other untreated sources.
How often should I recharge the bottle?
A full charge lasts for about 30 UV-C cycles. Recharge with the included USB-C cable.