I also found this posted by a Clorox Product Specialist
We recommend storing our bleach at room temperatures. It can be stored for about 6 months at temperatures between 50 and 70 degrees Fahrenheit. After this time, bleach will be begin to degrade at a rate of 20% each year until totally degraded to salt and water. Storing at temperatures much higher than 70 degrees Fahrenheit could cause the bleach to lose its effectiveness and degrade more rapidly. However, if you require 6% sodium hypochlorite, you should change your supply every 3 months
So at 50-70f the 6% solution would hold it's rate for approx 6 months. So it would degrade 1.2% that first year and a half and .94% in the year after that. So the 6% solution would be 3.84% after 2 1/2 years.

I think that this just drives the point (I think orginally brought up by CarlD?) that the greatest savings can be had if you purchase a 12% solution and then dilute it to half that strength for storage of that bleach until you can use it in the pool. If you need to...dilute the 12% bleach in old bleach bottles to keep on hand. Also...ask your bleach supplier how often they test their bleach, how often they receive deliveries in a month.


thanks chemgeek!
dan