Slight correction: 1 gallon of bleach adds 2ppm to 30,000 gallons, not 2 gallons, which would add 4ppm. Just a typo.

HOWEVER, as recommended, the 10 gallons adds 20ppm of chlorine to 30,000 gallons and that is EXACTLY how much you need to shock your pool with its high CYA level of 94.

Carl