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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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    Lakeland, FL
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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
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Join Date
    May 2007
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    South Central NJ
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    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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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    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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    Lakeland, FL
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    Re: Black Spot Algae

    LOL. Yeap, I understand. Thanks for the heads up.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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