I'm sure Waterbear or Chemgeek will chime in with a more detailed response soon, but I believe that the sodium persulfate is what's more commonly referred to as "non-chlorine shock", and I believe that it's usually used with bromine, or possibly one of the Baq products. Personally, if I don't know what it is, there's no way I'd put it in my pool. The fact that Leslies no longer sells it would also tend to make me lean toward getting rid of it instead of trying to use it.
Just my $.02....
Janet
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