Bleach is chlorine.
To "shock" a pool just means that you bring the chlorine up to shock levels.
Take a look at The Best Guess CYA Chart. This chart will help you get an idea of what maintanence level you should keep your chlorine at...and what shock levels have to be at according to your specific CYA levels.
Do you have a full set of test results?
Where did you get the results from? did you use a kit? what one?
dan
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