1 lbs of chlorine is approximately equal to 1 gallon of 12.5% bleach or 2 gallons of 6% bleach. So for 3 gallons of 6% bleach, you would need about 1.5 lbs of chlorine. Most SWGs generate less then that even running 24/7.

By raising your chlorine by 10 ppm are you attempting to shock with your SWG? I would not recommend using the SWG to shock but to continue using bleach.