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Thread: Pool water green and water 40 degrees

  1. #1
    Join Date
    Apr 2014
    Location
    Slatington, PA
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    Default Pool water green and water 40 degrees

    We recently had some warm weather here in Eastern PA and I did not check my pool water temp, but over the last 3 weeks my water went from clear to green. My AG pool remains uncovered all winter as we have no trees around our home and it generally remains clear all winter long, as I close after the water temp goes below 60F. I checked the water temp today and it is in the mid-40's.

    Any ideas as to why it greened up so quickly. Its only March!
    18' x 33' AG pool, 2HP US Motors / PMX pump with 200 # Columbia Sand Filter, (2) 4 x 20 FAFCO Solar Panels

  2. #2
    Join Date
    Jul 2013
    Location
    Northern Illinois
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    Default Re: Pool water green and water 40 degrees

    We had some hot, sunny weather for a while. Did you? Sorry about your pool....
    26K gal 20x40 rectangular IG vinyl pool; Apr 2014: New pump, liner, auto-cover, & water; Pentair Whisperflo 1HP pump; Pentair Trition sand filter; Cover/Star CS-500 auto cover; Taylor K-2006C; OTO

  3. #3
    Join Date
    Apr 2014
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    Slatington, PA
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    Default Re: Pool water green and water 40 degrees

    Yes, we did as I had stated in my post above. Although I would have been surprised if the water temp exceeded 60F, which I am told is the minimum temp that algae needs to grow.
    18' x 33' AG pool, 2HP US Motors / PMX pump with 200 # Columbia Sand Filter, (2) 4 x 20 FAFCO Solar Panels

  4. #4
    Join Date
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    Location
    Northern Illinois
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    Default Re: Pool water green and water 40 degrees

    Yea, I was just thinking the sun might have warmed up the top layers. I don't know that algae CAN'T grow below 60, but I know growth is significantly slowed.
    26K gal 20x40 rectangular IG vinyl pool; Apr 2014: New pump, liner, auto-cover, & water; Pentair Whisperflo 1HP pump; Pentair Trition sand filter; Cover/Star CS-500 auto cover; Taylor K-2006C; OTO

  5. #5
    Anonymous [GDPR] European in the UK Guest

    Default Re: Pool water green and water 40 degrees

    Quote Originally Posted by Slachey View Post

    Any ideas as to why it greened up so quickly. Its only March!
    I had know idea algae had a calendar. Nutrient rich water and low chlorine is sure to allow algae to bloom albeit a little slower when it cooler. No cover and some nice sunshine and away you go.

    I put my pool away in September with water temp at roughly 60F and won't open it again until June, done this several years and not had a problem but I have low nutrient water and a good dark cover, maybe you need to spend a little or keep the chlorine level up.

    Over here we tend to say algae won't grow below 50F (10C) just to be sure I do add chlorine and run the filtration 24 hours before I remove the cover. Sunlight is one component algae needs to bloom.

  6. #6
    Join Date
    Jul 2013
    Location
    Northern Illinois
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    817

    Default Re: Pool water green and water 40 degrees

    A clear explanation, Teapot. I agree that it must have been low chlorine and the sun. When you don't have a cover on the pool, I think you need to keep a close eye out as the weather warms.
    26K gal 20x40 rectangular IG vinyl pool; Apr 2014: New pump, liner, auto-cover, & water; Pentair Whisperflo 1HP pump; Pentair Trition sand filter; Cover/Star CS-500 auto cover; Taylor K-2006C; OTO

  7. #7
    swimdaddy is offline *Removed User* Weir Watcher swimdaddy 0
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    Default Re: Pool water green and water 40 degrees

    I had the same thing happen as spring came quite early here in the northwest. I just raised the chlorine with a gallon of bleach and all clear again, haven't even tested yet to know what my levels are.

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