Oxidizers work best in a low pH environment, and the efficacy of your spa shock is twice as great at a pH of 7.5 than it is at a pH of 8.0. Check to be sure that your pH is not too high before shocking. ... Lower pH level to between 7.2-7.6 before shocking. Remove spa cover, spa blanket and spa users.

Does oxidizing shock raise pH?

Both an oxidizer and sanitizer, cal hypo is quick dissolving and is the most frequently used in the pool industry. It will slightly raise your pH, so make sure you adjust pH while using it. As the name implies, it will also raise your calcium hardness levels in your pool slightly.

What does pool oxidizer do?

Pool Oxidizer, Generically known as Potassium Monopersulfate, provides a non-chlorine method of oxidizing your pool water. A much safer and less messy way than using an unstabilized chlorine. It is just as effective in burning off organic contaminants and converting combined chlorine into free chlorine.