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Thread: Slamming for long periods to fight black algae

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    Join Date
    Aug 2013
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    Phoenix AZ
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    Slamming for long periods to fight black algae

    I have been a TFP voyeur for a couple of months now. I found this sight while searching for answers to Black algae solutions. I bought a TF 100 test kit. I drained my pool by 60% + to get my CYA down from the 100 level that it was at. I have been slamming for three weeks now. Water looks great and I think the algea is fading slowly. PH and alkalinity have been creeping up. I know the PH will read high during slam but should I reduce the alkalinity? The alkalinity was 100 when I started and the PH was 7.5. I think it is going to take a few months to rid this black algae as it was there for 6 or more months before I knew what it was. Do I really need to keep it at slam levels or just an elevated level and can I back off the pump from running 24/7? I have also been scrubbing with a wire brush every day. Current numbers are as follows.
    PH 8.2+
    FC 16
    CC 0
    TA 120
    CH 320
    CYA 40
    12k gallon, AG, pebble, sand filter, 1hp single speed pump, G3 Barracuda, Liquidator, TF 100 test kit

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Slamming for long periods to fight black algae

    Very good question. Since your pool is cleared up (right?) and you would likely pass an OCLT (right?) then I think I would simply elevate the FC (probably around 6-8 ppm) and continue to scrub with that brush.

    The brush is the key to eradication....you just need a little extra chlorine to make sure everything stays dead in your pool.

    If your pH stays at 8.0+ when the FC gets below 10 ppm, then would be the time to lower it. Leave your TA alone for now...see what it tests after your FC gets below 10 ppm
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Aug 2013
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    Phoenix AZ
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    Re: Slamming for long periods to fight black algae

    Pool water is clear. Just have black spots still. I passed an OCLT a week ago. I will drop chlorine level to 8PPM and continue scrubbing. Thanks for the fast reply.
    12k gallon, AG, pebble, sand filter, 1hp single speed pump, G3 Barracuda, Liquidator, TF 100 test kit

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    Melt In The Sun's Avatar
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    Oct 2009
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    Tucson, AZ
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    Re: Slamming for long periods to fight black algae

    Are you using a big wide wire brush, or a skinny one? I've found that a tiny brush works much better, since you can really rip into the spots rather than just scratching up the top of them. You need to be in the pool with goggles though, but in Phoenix it's probably still swimming weather, right?
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Join Date
    Aug 2013
    Location
    Phoenix AZ
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    Re: Slamming for long periods to fight black algae

    Pool is a little cold but still doable. I use a wire brush on my long pole.
    12k gallon, AG, pebble, sand filter, 1hp single speed pump, G3 Barracuda, Liquidator, TF 100 test kit

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