In a 14K gallon pool, each quart of 8.25% bleach will add 1.5ppm of chlorine and each of the 121-oz jugs will add about 5.5ppm. Shock level is based on your CYA reading so with a CYA of 30, you'll want to add enough bleach to take your chlorine level up to 15ppm.
http://pool9.net/cl-cya/
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