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Hello, I live in New England, just went through hot and humid weather. I have ph reading of 8.2, (purple color) which I believe indicates "add acid." Just yesterday I added ph increase, and chlorine tabs. Can I just wait and let the ph decrease on its own? Also, two days ago I shocked my 15...

I have The size of your pool in gallons 12000 g oval, above ground, vinyl, cartridge filter. On opening in the northeast late May, How much initial shock do I add, and how many chlorine tablets, and what other chemicals? What is the best testing equip to buy? Thanks