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Pool is 2 years old. 29k gallons. Salt water. TA = 70, pH keeps going 7.8 or higher. Added MA to lower to 7.2 measured 24 hrs later. 36 hrs later back up to 7.8. I'm trying to get ready for an Ascorbic acid treatment to get rid of some stains. CYA = 0. I get a certain amount of very...