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    Attacking the Algae Tub: FC testing question

    FYI: when your FC is that high the Ph test is not reliable.
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    Mustard Algae - Bubbles?

    Double check your Clorox, the "splash-less" bleach has a thickener (Cetyl betaine) that is also used elsewhere as a foaming agent. I had a somewhat similar experience in my spa and blamed the thickener. Unfortunately I do not know how to get rid of it, I had only opened my spa when I...
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    Algae growing with sufficient FC levels

    I'm sure better circulation will help, you might also consider borates. I understand that they slow algae growth.