5.5 gallons will add 10ppm of chlorine to your pool. With a CYA of 60, you'll need to shock up to 20. Did you mean FC of 7.6 instead of CC of 7.6? I hope so! Tomorrow, sock it with bleach every few hours. Each time, add enough to get back to 20. In your pool, each gallon of 6% bleach will add about 1.8ppm of cl. (Remember, most bleach is sold in 3 quart jugs. A gallon is 4 quarts.) Run pump 24/7.