What it does...
AOP is the Advanced Oxidation Process. When germicidal UV light and ozone react the result is the production of hydroxyl radicals. This reaction is known as Advanced Oxidation Process, or AOP. Hydroxyl radicals are powerful oxidation agents, quickly destroying bacteria, viruses, pathogens and other contaminants that occur in the water. Hydroxyl radicals also help destroy certain chlorine resistant micro-organisms giving you cleaner water in your spa / swimming pool.