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Thread: Black Algaeon a Hot Tub

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    Black Algaeon a Hot Tub

    I have black Algae on the sides of my hot tub. Most are just above the water line but some are below. What have you found to be successful in removing it? Leslie Pools said their chemicals won't work because the water is too hot. I have scrapped what i can off and it was a tough job, like trying to scrape off old glue!

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    Re: Black Algaeon a Hot Tub

    What is the surface of your hot tub? What did you scrape it with? Do you have any pics of the algae?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Black Algaeon a Hot Tub

    The tub surface is a smooth plastic (acrylic). I used a kitchen sponge with a scrubbing side, 3M I think. I will have to take a picture this evening.

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    Mod Squad Bama Rambler's Avatar
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    Re: Black Algaeon a Hot Tub

    I have never heard of black algae on a fiberglas surface. If you scrape the top of one off and smear it on a piece of white paper, what color is it?
    Dave J. TFP Moderator
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    Re: Black Algae on a Hot Tub

    I rubbed a sccrping on some paper and, for the most part, it smeared clear. I was in a time crunch and didn't get any pictures.

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    Re: Black Algaeon a Hot Tub

    If it's black algae (it should look like a black scab and can be smeared dark green on paper)

    If your tub is acrylic I'm assuming it's a standalone tub. Considering the small size of the tub (400gallons?) I would drain it completely then get in the tub and use a bleach soaked sponge and rub off what you can. If the sponge isn't coarse enough use something like a plastic scraping tool http://www.amazon.com/Nylon-Pan-Scraper ... fe+scraper

    Basically black algae is usually a big deal since it's very rugged and can take a beating when it comes to shocking a pool. since you can drain your tub and physically scrape by hand and use bleach directly it shouldn't be too much of a problem. After you have everything looking clean I would fill the tub with a black algae shock level of chlorine to make sure there isn't anything hiding out in the plumbing that can start the process over again.
    -Kevin
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    Re: Black Algaeon a Hot Tub

    Thanks, you are correct in your 400 gal spa guess and I'll take the steps you recommend. What would a Black Algae level of chlorine shock be?

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    Mod Squad Bama Rambler's Avatar
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    Re: Black Algaeon a Hot Tub

    Black algae will smear green on a white paper, so I suspect what you have isn't algae. The best solution is to drain and clean as said above.
    Dave J. TFP Moderator
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    Re: Black Algaeon a Hot Tub

    chlorine-cya-chart-t2346.html#p18157

    I think the yellow mustard level should be enough.
    -Kevin
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    Re: Black Algaeon a Hot Tub

    I have scrapped what i can off and it was a tough job, like trying to scrape off old glue!
    That doesn't sound like algae at all. Chlorine may have no affect on whatever it is.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Black Algaeon a Hot Tub

    if it's sticky it might be oils or maybe tree sap that turned dark from dirt. pictures!!
    -Kevin
    X-Pert Pool Service
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    X-Pert Pool on Facebook and @XPertPoolServic on Twitter
    22,000 gal / 16' x 32' / Vinyl / Hayward s244t /Pentair SuperFlo 1 hp

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