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I have a 25,000G above ground pool. What would cause the pH to keep climing? My recent readings last night are: pH 7.8 (was 7.4 2days ago) No water added, no rain. Shocked with Ca++ hypochlorite once the night before this reading. TA 100 CYA 60 FC 6 Hardness 260 I use 10% liquid chlorine...