How much chlorine is needed to shock a 30000 gallon pool?

The amount of chlorine shock always depend on how much you want to raise your cholrine level for and the total amount of water in your pool. I was told by pool experts that the amount is 2.5 gals per 16,000gals or 1.5 gals per 10,000gals, once a week. During the summer, make sure you shock every 7 days, after sundown, when all swimmers are done. Shocking at night keeps the chlorine in the water longer.