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Thread: Algae - the contradiction?

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    chessie6's Avatar
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    May 2010
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    Algae - the contradiction?

    I'm a bit confused here .. We use a tarp to cover our pool for the winter for the reason that it blocks the light to help prevent algae from growing. So if algae doesn't like darkness, then why does it grow first and the best under the darkest places in my pool such as under the rungs of my ladders?

    Thx,
    Jan
    Summer: 19 x 37 Pacific Graphex IG modified oval, aztec marine vinyl liner, 24,000 gal, 3.5 feet to 8 feet, 1 hp Hayward C4025 Swim Clear 4-cartridge filter, 12.5% Liquid Pool Shock for sanitizing, 1 super wide mouth skimmer, 4 returns (2 therapy jets in steps), Hayward Heat Pro heat pump, non-curved pool slide, 6' jump board, 8 ml blue solar cover, TF-100 test kit, had pink algae in 2010 Winter: Hot Springs Vista Spa, 500 gallons.

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    Beens's Avatar
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    Re: Algae - the contradiction?

    Well, off the top of my head I would say maybe those little dark places are also the ones with less/poor circulation? Just a thought..
    18' x 48" (42" water depth) Intex Metal Frame 6,700 Gallons
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    Re: Algae - the contradiction?

    Do you cover your pool before the water temp reaches 60 degrees or lower? Do you uncover it and start chlorinating the water before the water reaches 60 degrees or higher?
    20000 Gallon, Sand Filter, IG Plaster, Hayward Aqua Rite 40k SWG, TF-100 Test Kit, Taylor SpeedStir

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    chessie6's Avatar
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    Re: Algae - the contradiction?

    To clarify, we close the pool sometime in October so for us that means the water is around 60, and with an opening in April (which is pretty early for CT) we have never opened to algae. But in the summer, there's always a slow growth of algae in the dark places like under the ladder or behind the skimmer plate .. if it were to grow I would think it would pick the spots with more light, but it doesn't. Maybe then it's not the light but where circulation is poor, as you stated Beens.
    Summer: 19 x 37 Pacific Graphex IG modified oval, aztec marine vinyl liner, 24,000 gal, 3.5 feet to 8 feet, 1 hp Hayward C4025 Swim Clear 4-cartridge filter, 12.5% Liquid Pool Shock for sanitizing, 1 super wide mouth skimmer, 4 returns (2 therapy jets in steps), Hayward Heat Pro heat pump, non-curved pool slide, 6' jump board, 8 ml blue solar cover, TF-100 test kit, had pink algae in 2010 Winter: Hot Springs Vista Spa, 500 gallons.

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    Re: Algae - the contradiction?

    Different species of algae have different ideal sunlight amounts for growth, just like plants. Green and black algae tend to like sunlight, but if there is chlorine in the pool then they are prevented from growing except in areas of poor circulation where the chlorine level can get too low. Yellow/mustard algae prefers shade and is also more chlorine resistant.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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