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Thread: Blackspot Algae-Need Advice

  1. Back To Top    #1

    Join Date
    May 2010
    Location
    Mountain View, Arkansas
    Posts
    64

    Blackspot Algae-Need Advice

    Hello all,

    I switched to the BBB method at the beginning of the summer and you guys have helped me create an awesome sparkling, chemically balanced, and best of all cheap to maintain swimming pool. But last week I started noticing black spots all along the walls of the pool. I have counted about 11 or 12 spots. They are basically all even with each other around the pool. I have taken a brush and gone over them and they will not wipe off. So I have assumed it's blackspot algae anyway. I have began shocking the water at yellow mustard shock level and have brushed twice today. Does anyone have any other advice? I heard this is hard to get rid of and I have closed the pool till I get this resolved. Kids and wife not happy! Here are my numbers:

    TC 25
    FC 25
    CC 0 (Is this possible?)
    pH 7.5
    TA 100
    CA 243
    CYA 35
    Borates 45 to 50
    Salt 300

    Thanks everyone,

    Al.
    Mountain View, Arkansas, 23,000 gallon in-ground concrete pool with a 24-in Hayward Pro-Series Sand Filter with side-mount. Chlorinator is attached but only use occasionally and a 1 hp pump.

  2. Back To Top    #2
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: Blackspot Algae-Need Advice

    Can you post a pic? brushing has no effect whatsoever? doesn't sound like BA.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  3. Back To Top    #3

    Join Date
    May 2010
    Location
    Mountain View, Arkansas
    Posts
    64

    Re: Blackspot Algae-Need Advice

    Here is a picture. I have about 12 of these in the pool. Scrubbing doesn't do anything to them
    Attached Images Attached Images
    Mountain View, Arkansas, 23,000 gallon in-ground concrete pool with a 24-in Hayward Pro-Series Sand Filter with side-mount. Chlorinator is attached but only use occasionally and a 1 hp pump.

  4. Back To Top    #4
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: Blackspot Algae-Need Advice

    Try testing a spot w/a vitamin C tablet.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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