Thank you for the information. It confirmed what I suspected but didn't know for sure.

I am in the habit of keeping a never-opened bottle of plain bleach with my jugs of stored water. Now I don't have to worry about it breaking down in time. If it's sealed so it doesn't evaporate, isn't exposed to direct sunlight or excessive heat, it's still good.

That's what I wanted to know. <img src="/images/graemlins/smile.gif" alt="" />

Sue