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Thread: patch of yellow algae but pool was balanced???

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    patch of yellow algae but pool was balanced???

    This morning I got up and noticed a patch of yellow algae on the base of one wall. I tested the water and pool chemistry while not ideal seemed ok
    enough not to start algae growth. specifically the readings were;
    Chlorine - 2.0
    PH - 7.5
    Total Alkalinity - 60
    hardness = 350
    stabilizer - 40
    water temp - 83
    pump running 7 hours daily.
    Weather conditions have been hot and rainy lately.

    The patch was small, about 8-10 inches in diameter.
    Any ideas as to why this algae bloom started?
    6600 gal IG concrete/gemcoat
    Fresh water
    1 HP motor
    StayRite PLM 100 system 2 filter
    full sun
    Treasure coast, Florida

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    Mod Squad jblizzle's Avatar
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    Re: patch of yellow algae but pool was balanced???

    Your FC is too low for your CYA level. Is there good circulation where it appeared?
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: patch of yellow algae but pool was balanced???

    Scrub that algae and get some bleach in there, fast. If you don't kill it, it will start growing and using bleach even faster.

    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: patch of yellow algae but pool was balanced???

    Oh I scrubbed it and dumped in a full jug of bleach......this morning no algae. Like I said, it was just starting.
    I rechecked my cya level, and it was around 50 not 40 so I think that my fc was too low for the level of cya.
    I have to relearn every year that as the weather warms I have to increase my vigilance.....Got off easy but LESSON LEARNED!!!
    6600 gal IG concrete/gemcoat
    Fresh water
    1 HP motor
    StayRite PLM 100 system 2 filter
    full sun
    Treasure coast, Florida

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    Mod Squad jblizzle's Avatar
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    Re: patch of yellow algae but pool was balanced???

    With a CYA of 50ppm, your FC should never be below 4ppm ... so should be targeting 6-7ppm everyday: See the FC/CYA Chart.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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