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Thread: new algae problem, any thoughts?

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    new algae problem, any thoughts?

    29,000 SWG inground

    FC 10
    pH 7.5
    TA 110
    Borates 50ppm
    T 72 F
    CYA 26, added 7lbs. last week
    pump 9 hrs. 4.5h am/ 4.5hpm
    Ca++ 310


    Getting ready for the season to open here in N.O.,LA. However, I had a recent algae bloom for unknown reasons. My numbers seem fine to me. The only unusal thing to happen was a sudden introduction of fresh water from a storm the other day. The reason I bumped the FC llast week to compensate for the increasing CYA. Any suggestions on the bloom and to get rid of the green?
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    4x9m seawater pool, 2.5hp pump, no filter
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    tagprod's Avatar
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    what was the chlorine and cya levels before the storm? that cya level seems really low for a swg. Maybe you didn't have any chlorine in the pool?
    Brian
    20K IG Gunite w/ raised 7ft spillover spa. 1.5 HP Hayward Northstar pump 425 sq ft Hayward cartridge filter, Colorlogic lights AquaRite SWG AquaLogic PS-8 control
    1hp pump for sheer descent

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    JasonLion's Avatar
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    Welcome to TFP!

    I would not expect algae to last for long with FC at 10 and borates of 50. It isn't that hard for some algae to get started right after a storm, but if you keep your FC level steady, which generally means extra chlorine, then you can usually beat it easily. However, if the FC level dropped once the algae got going then it makes a lot more sense. A big storm can overwhelm the chlorine in the pool and once the algae gets going the SWG can't keep up.

    In any case the solution is extra chlorine, I suggest using bleach, and a longer pump run time. I would bring the FC level up to 15 and make sure it stays there by checking and adding extra chlorine at least twice a day and run the pump 24/7 for a couple of days and that should clear it up.
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  4. Back To Top    #4
    Tagprod,

    The CYA was probably around 55? (26 plus the 7lbs I added). The FC was 4.5 before the storm.
    house/pool builder
    5x11m pool, 1.5hp pump, sand filter, salt water chlorinator
    4x9m seawater pool, 2.5hp pump, no filter
    6x11m freeform pool, 2hp pump, cartridge filter
    4x8m infinity pool. 2 pumps, 2 cartridge filters
    4x4m spa, 1hp pump, cartridge filter

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    duraleigh's Avatar
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    mbone,

    Did you bump your FC to 15 with liquid chlorine per Jason's suggestion? Relying on an SWG for algae removal is frequently not very effective. A big dose of chlorine is normally the fix.

    How does your water look?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    tagprod's Avatar
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    Jul 2007
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    Quote Originally Posted by mbone
    Tagprod,

    The CYA was probably around 55? (26 plus the 7lbs I added). The FC was 4.5 before the storm.
    Let me make sure I got this all straight - your CYA before the storm was 26 and FC was 0(?) then after the storm you added CYA and chlorine to up your levels - is that accurate?
    Brian
    20K IG Gunite w/ raised 7ft spillover spa. 1.5 HP Hayward Northstar pump 425 sq ft Hayward cartridge filter, Colorlogic lights AquaRite SWG AquaLogic PS-8 control
    1hp pump for sheer descent

  7. Back To Top    #7
    Off to Sam's to get bleach. I was concerned about running the pool at high CYA(80) as I always ran it in the 30 range. As I continue to read, it seems that my SWG pool will be more efficient with ^CYA.
    house/pool builder
    5x11m pool, 1.5hp pump, sand filter, salt water chlorinator
    4x9m seawater pool, 2.5hp pump, no filter
    6x11m freeform pool, 2hp pump, cartridge filter
    4x8m infinity pool. 2 pumps, 2 cartridge filters
    4x4m spa, 1hp pump, cartridge filter

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