Municipal water districts across the US use chlorine to purify water so you should too in the backcountry! Forget about iodine, heavy pumps, UV pens, and other processes...keep it simple A+B and time = purified!
Best stuff for the cost and the amount of gallons you can purify verse the amount of weight. I should know...I have used up 4 Aqua Miras in my life and that's 120 gallons of purifying!
This review was written in the old system and had content requirements that are different than reviews written today.