Jacks Magic Stain Solution #3 Safe Shock, 2 lb Bottle | JMSAFE2

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.