Sanitation vs. Oxidation
Most people rely on one product to sanitize and oxidize their pool water. However, when chlorine or other sanitizers are required to do double-duty, their sanitizing efficiency is greatly reduced. As the level of organic contamination increases, more and more sanitizer is consumed for oxidation, so less is available for disinfection.
That's why DuPont recommends a system approach to pool care that uses chlorine, or another EPA-registered sanitizer, to kill bacteria along with weekly use of a non-chlorine shock oxidizer to eliminate organic materials introduced by bathers and the environment.
Without regular oxidation, organic contaminants will continue to build up, potentially consuming sanitizing chemicals faster than they are being supplied. When this happens, water quality begins to deteriorate, algae can develop, or the water can become dull and cloudy. Most importantly, adequate protection against disease- and infection-causing microorganisms is difficult to maintain, and bather health cannot be assured.
So, for best results always use a non-chlorine shock oxidizer in conjunction with your EPA-registered sanitizer.