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Hello, I just got the TF 100 test kit and tested my pool. The results are as follows, FC 7.5 CC 0 Calcium Hardness 550 Total Alkalinity 220 CYA 60 PH 8.2, I keep lowering the PH with dry acid but it keeps rising back up. According to pool math I must drain pool by 1/3 and add 78 oz of dry...