SpaGuard Enhanced Shock 2#. SpaGuard Enhanced Shock is a multipurpose shock with four functions in one: shocks, clarifies, flocculent and pH buffer. Restores water sparkle Removes unpleasant odors Treats and soak in as soon as 15 minutes Compatible with Chlorine or brominated spas and those using ozone or ionization systems.. 58.2% Sodium Dichloro-s-Triazinetrione