S.O.S. is a multi-functional shock treatment that oxidizes and boosts free chlorine concentrations creating clean, clear water fast. Its unique formulation contains a powerful clarifier, oxidizer and chlorinating agent and will not affect that water's pH, total alkalinity or calcium levels. The built-in clarifier ensures contaminants are more readily removed by routine filtration which prevents dull, hazy water. For a quick clean that can be part of your weekly maintenance schedule, save time and hassle with S.O.S.