www.goodforyou.ca/ is the manufacturer (based in Canada) with near worldwide distribution.A 1/2 oz. bottle is $20 U.S. Oxygen is used to stabilize water for long term storage against bacterial growth. It will degrade with exposure to sunlight. I emailed regarding it's effectiveness against cryptosporidium. The only drawback I can see is it's single application. Iodine can be utilized both for water purification and wound care.<br><br>