If that's normal 6% bleach add 2 bottles. If they are actual gallons of chlorinating liquid 10 or 12.5% only add one.I have 24 lbs of baking soda. I’ll add 12 right now. I took out the tablets and I have 5 gallons of bleach.
You will probably need that 12 poinds, but try to only add half right now. We like to move up in stages so we don't overshoot our target.