Shelf Life of Sodium Hypochlorite

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A more complete table is shown at the bottom of this link where you can see that roughly speaking the half-life of product varies as the square of the concentration, such that 6% bleach lasts about 4 times longer than 12.5% chlorinating liquid, all else equal. You can also see that the half-life is roughly cut in half (product lasts half as long) with every 10F increase in temperature.

The actual rate of loss is also very dependent on the purity of the product which may account for the seemingly small differences vs. temperature in the link you gave. In my experience, the link I give above is reasonably accurate, at least for 12.5% chlorinating liquid which is what I use.

Richard
 
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