You probably aren't using enough acid. Muriatic acid is the best thing to use to lower PH. Dry acid/PH Down is alright to use, but it is more expensive and you need larger quantities.
If you post a full set of test results we can give you more detailed feedback.
you cant get it down. I cant get mine to come up. lol. lets split water. lol. I have been aerating for 3 days and it wont move above 7.2. i gave up. if it aint broke im not fixing it everything else is in check!
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