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Thread: Black spots

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    Black spots

    I just vacuumed my pool and I have black spots ( looks like) in the corners of my deep end. I have tried brushing them and they do not seem to move. Any suggestions or help would be appreciated. I have a inground vinyl pool.

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    Mod Squad zea3's Avatar
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    Re: Black spots

    You can try rubbing them with puck and see if it fades any. What are your most recent test results?
    TFP Moderator
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    Re: Black spots

    Just tested pool
    Here are results
    FC 1
    CC 0
    TC 1
    PH 7.8
    TA 150

    Added bleach to up my FC to 2.5

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    JasonLion's Avatar
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    Re: Black spots

    Do your know your CYA level? If not, you should take your water to a pool store and get a CYA test result.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Black spots

    Can I test my CYA using my TF 100 kit or is that not a valid test?

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    JasonLion's Avatar
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    Re: Black spots

    Yes, the TF-100 includes a CYA test.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Black spots

    Quote Originally Posted by zea3
    You can try rubbing them with puck and see if it fades any. What are your most recent test results?
    I currently have a problem with black spots (looks like black algae) and I can tell you that rubbing pucks over it will only makes it fade but it will return again. I tried everything including scrubbing with stainless steel brush, powder in a sock method, super chlorination, nothing works. Black algae is a nightmare.

    I'm currently researching acid wash, perhaps this is the only way.

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    In the Industry

    duraleigh's Avatar
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    Re: Black spots

    I'm currently researching acid wash, perhaps this is the only way.
    I don't believe so. I believe all forms of algae that occur in pools can be controlled and eliminated with proper chlorination. Some are simply more difficult than others.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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