Sodium persulfate is Na2S2O8 and is not the same as regular non-chlorine shock which is potassium monopersulfate where the critical part of it is KHSO5. Sodium persulfate is a VERY strong oxidizer with a reduction potential of +2.010V for S2O8(2-) + 2e- --> 2SO4(2-)
Ben indicated on PoolSolutions that persulfate shouldn't be used (see this link).
Richard
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