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  1. jccams

    week and a half of shocking and no improvement

    Remember that the PH test is not accurate when FC is over 10.
  2. jccams

    What is it?

    Yes as long as chlorine levels are at or below shock level that corresponds to your CYA.
  3. jccams

    Algae Keeps Coming Back, Even After a SLAM

    The other thing that comes to mind is your confidence in the CYA level. Is it really 30 or could it be higher and the FC level you are maintaining isn't sufficient.