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Thread: Black Spot Algae

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    bobodaclown's Avatar
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    Apr 2011
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    Murrieta, CA
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    Black Spot Algae

    Hello All,
    Posting for a friend.
    They have black spot algae. Pool is Diamond Brite (Concrete).
    Numbers are PH 7.2, FC 5, CC .5, TA 140, CH 750, CYA 40. 17K pool.

    They use 10% liquid chlorine, she normally pours 2.5 gallons in once a week. I've recommended that she adds 3 times a week 1 gallon each time. I've recommened she bring it to shock level (15), maintain it there and brush using a stainless steel brush to expose the algae. I showed them pool calculator, got the total she needs to bring it up to 15 for shocking and try to maintain it.

    Pool also has what appears to be calcium deposits on the sides, brushing with the SS brush releases it into the water.

    Any suggestions.

    Thanks in advance.
    Bobo
    Murrieta, CA. 15K (Est) pool/spa. Hayward Tristar SP3220EE 2.70HP pump, Hayward Swimclear Cartridge filter C4025 425sqft (PA106), Pentair Mastertemp 400 heater. TF-100/Speedstir

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    Join Date
    May 2007
    Location
    South Central NJ
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    3,192

    Re: Black Spot Algae

    After the BA is solved, she'll need to dilute. The calcium level should be 1/2 that.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    In the Industry

    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    30,424

    Re: Black Spot Algae

    I have to post this every time I see "for a friend (or relative)".

    Very difficult to fix someone else's pool when they are not interested enough to come online and learn on their own. Even if you fix it for them, it usually reverts back quickly because they don't change the habits that got them there in the first place.

    Frquently, you get blamed because your methods "didn't work".

    No good deed goes unpunished!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    bobodaclown's Avatar
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    Apr 2011
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    Murrieta, CA
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    Re: Black Spot Algae

    LOL. Yeap, I understand. Thanks for the heads up.
    Murrieta, CA. 15K (Est) pool/spa. Hayward Tristar SP3220EE 2.70HP pump, Hayward Swimclear Cartridge filter C4025 425sqft (PA106), Pentair Mastertemp 400 heater. TF-100/Speedstir

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