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Thread: High chlorine but still have algae

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    High chlorine but still have algae

    The chlorine in my pool is at 4.0 ppm, yet I recently noticed green algae on the wall of my plaster pool. Why would this happen?

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: High chlorine but still have algae

    What is your CYA level? For that matter, post up a full set of test results.
    Jason, TFP Moderator
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    Mod Squad JohnT's Avatar
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    Apr 2007
    SW Indiana

    Re: High chlorine but still have algae

    4ppm is not high chlorine.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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    Re: High chlorine but still have algae

    If your CYA level is really high, you need more chlorine to combat algae. That may be your problem. Some forms of powdered chlorine will increase your CYA level. I just recently experienced this when switching from liquid chlorine to powdered chlorine based on a pool store recommendation I should've known not to take their advice; luckily I caught it relatively early.

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