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What does AO stand for?

AO stands for active oxygen

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This definition appears somewhat frequently

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Other Resources: Acronym Finder has 134 verified definitions for AO

Samples in periodicals archive:

Oxygen America is the premier supplier of Active Oxygen and Ozone Supplements including: Mr. Oxygen, OxyLift, OxyEarth, Super OxyFlush, OxySulfur, Plant Minerals...
Aquablanc is a spa sanitiser system using active oxygen tablets to keep your hot tubs water clean rather than harsh chemicals