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    Using muriatic acid in vinyl pool? Yes or no?

    I have an 18' round AG pool. I installed a new SWG and pump. Yes I know what I got is over kill for the pool size. But we'll be getting a bigger pool later. The info on the new SWG Blue works BLSC20-T says not to use dry acid to reduce PH. Pool store says not to use MA because it will damage...