ACO® is a highly innovative, ecofriendly liquid product, especially effective in any outdoor pool, including salt water pools. ACO® has two main features: ACO® increases the natural disinfection power of the sun Free Radicals are produced to amplify the oxidation of the sun. ACO® is an Active Catalytic Oxidiser that works by using the energy of the sun or UV light to catalyse the formation of free radicals to disinfect pool water. The radicals work just like chlorine to remove pollutants but they do not form combined chlorine. ACO® is not consumed in the process, it just makes what happens natuarly much more efficient. ACO® also protects chlorine from photolysis by sunlight and makes it last three times longer in outdoor pools. ACO® does the same as cyanuric acid, but instead of reducing oxidation capacity, ACO® amplifies the disinfection of water.