Quick final step to safe water
Though not rated for my brand water filter, I use this product as the final post filter step to render harmless any nasties that made it though. Contaminated water can get you wicked sick. 5 drops and an extra 5 minutes per 1L Nalgene is invaluable peace of mind. I can detect a little chlorine taste in the treated water, but far less than in Chicago tap water, and certainly not offensive.