Thats what I did was used 8.2, instead of adding 3 quarts and 1 cup as the calculator suggested, I added a little less then 2 quarts, checked it 6 hours later and my PH is 7.2 now and TA is 200. So I enter my new numbers in the calcultor, changed my size from 21000 to 20000 gallons, it said I...