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Thread: What is this "light green" blur/stain?

  1. Back To Top    #1

    Join Date
    Dec 2015
    Location
    San Jose, CA
    Posts
    31

    What is this "light green" blur/stain?

    Hello
    From time to time, at 1 or 2 corner slots of my pool, there was a small area of "light green" blur or stain right on the surface of the vinyl, I don't know what it is, or anything algae related. Every time I used a pool-brush to wipe it off.

    Everything else is fine, the water is clean and blue, latest test result is below:
    FC: 5
    PH: 7.5
    TA: 70
    Calcium Hardness: 80
    CYA: 50

    Thanks.

    Kevin
    10,200Gals, 10X34, 3'-4'4'' deep, rectangle in-ground vinyl pool; Solar cover;
    3/4HP Advantage pump; CC150 Pentair cartridge filter;
    NC22 SmartPool Smart-Kleen robot; and a 2-wheel PoolCleaner of HAYWARD
    Tailor K2006 test toolkit;

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,201

    Re: What is this "light green" blur/stain?

    It is probably algae. 5ppm of FC is at the low end of your FC range. Trying keeping the FC around 8ppm which is the top of your recommended range, and try to adjust the returns so you get better circulation. Usually when we see areas in a pool that continually see algae its a combination of low chlorine and poor water circulation. Brushing the pool after adding chlorine will make sure the chlorine gets to the area where the algae returns.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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  3. Back To Top    #3

    Join Date
    Dec 2015
    Location
    San Jose, CA
    Posts
    31

    Re: What is this "light green" blur/stain?

    Thanks lot, will try.
    10,200Gals, 10X34, 3'-4'4'' deep, rectangle in-ground vinyl pool; Solar cover;
    3/4HP Advantage pump; CC150 Pentair cartridge filter;
    NC22 SmartPool Smart-Kleen robot; and a 2-wheel PoolCleaner of HAYWARD
    Tailor K2006 test toolkit;

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