Getting ready for boric acid add. Pool calc said that I needed to add 3/4 gallon MA to lower pH from 7.8 to 7.2 or so while lowering TA from 90 to 60. Have spa overflow that I believve serves as a good aerator. About how long should it take for TA to reduce and pH to rebound? Boric Acid coming tomorrow and would like to dump it tomorrow night or Saturday morning if possible. Will be testing of course but about how long should I anticipate?