O2 safe shock is a non-chlorine shock (but not a persulfate compound) . It yields more than 12% active oxygen (3 times more oxygen than persulfate compounds) . O2 safe shock can be used as an acid wash pretreatment, making tough copper stains much easier to remove. Please note: not recommended for maintenance in chlorinated pools, but ideal for biguanide, ozone, and ionization systems.
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