It's probably going to take somewhere in the ballpark of about 12 lbs. of baking soda to get up to 90 or 100. I would add 3 lbs. at a time and wait about 4 hours to let it circulate. Then, retest and see where you are. Better to do it in small doses rather than all in one shot. As long as you space the doses out by about 4 hours and retest before adding more, I think you'll be OK.

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