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Thread: Algae in the winter?

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    Nod's Avatar
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    Algae in the winter?

    So I decided to go cover free this winter and some stuff has gotten in the pool, but I have fished most of it out. Well this past couple of weeks, it looks like alge took over. It is a nice shade of green. The temp has been in the 50's. I didn't think algae could grow in this climate?

    Should I treat now or wait til spring?
    Nod
    16x32 IG, polymer panel Vinyl Pool w/approx 21k gallons of H20
    1 HP Hayward Pump & 300lb Sand Filter ~ Polaris 280 Pool cleaner
    ~~Nashville, NC~~

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    Re: Algae in the winter?

    Poconos (Al) on The Pool Forum showed pictures of algae growing under ice. Algae can grow in cold water, but does so more slowly.

    If you treat it now, it may be easier. All you have to do to prevent it is to maintain chorine in the water over the winter. So long as the water doesn't freeze, this is pretty easy to do since chlorine usage in cold water is very low at < 1 ppm FC per week if the water is not exposed to sunlight. You could also try using PolyQuat 60 algaecide upon closing next time, though I don't know how long it will last in the water -- if there's no chlorine then it will last longer and if there is minimal filtering it will last longer (it's a clarifier so will get filtered out if there's stuff to filter in the pool). See this Pool School article for more info.

    Richard
    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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    budster's Avatar
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    Re: Algae in the winter?

    I second the geek. 8)
    http://www.swimmingpool.com/

    "Leave the gun...take the cannolis"

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    Re: Algae in the winter?

    Yep, I get "green pool" here in North Carolina in the winter, too. Chem geek has got it covered!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Nod's Avatar
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    Re: Algae in the winter?

    Thanks everyone - I hit it with 4 jugs of bleach - its clear now - I hadn't put anything in it since november thinking that algae wouldn't grow, so why bother, but now i know!
    Nod
    16x32 IG, polymer panel Vinyl Pool w/approx 21k gallons of H20
    1 HP Hayward Pump & 300lb Sand Filter ~ Polaris 280 Pool cleaner
    ~~Nashville, NC~~

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    Re: Algae in the winter?

    Quote Originally Posted by chem geek
    So long as the water doesn't freeze,
    So, what happens if the water DOES freeze?
    I was thinking about chipping a hole in my skating rink (joke, not actually skating)
    and getting a head start on the algae while it is somewhat dormant.
    I was hoping the ice cap might prevent loss of chlorine, maybe?

    My pool is in swamp-for-more-than-a-year mode.

    Will the bleach diffuse itself enough without the pump? (which is winterized)
    In-Ground. White Marbelite plaster. 21'-7" x 38' Figure Eightish Custom diving pool with 9' deep end. 24,750 Gallons. Pentair Challenger 2 hp pump, Pentair Clean and Clear Plus CCP420 Cartridge Filter, Paramount PCC-2000 In Floor Cleaning system with Debris Canister. Pool/House was a foreclosure that sat dormant for at least 2 years, and was an actual swamp. Using BBB and POP I made it a sparkling backyard oasis. I have a TF100 kit, and I know how to use it (mostly!). This is my FIRST REAL pool, but thanks to TFP, I know what I'm doing! (mostly!).

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    Re: Algae in the winter?

    I just meant that it's easy to add chlorine to the water when it's not frozen. If you don't mind chipping/boring a hole to get access to the water, that's fine, but if you add chlorine and there is no circulation, it can settle to the bottom of the pool as its denser than water until thoroughly mixed. If you have a vinyl pool, that might be a problem. With a plaster pool, it might be OK so long as you don't dump a bunch in quickly. If there is any way for you to very slowly pour some in and then use something to try and stir the water, then that would be good.

    However, don't expect the chlorine to spread to other areas of the pool so you could get algae in those areas. Multiple chip/bore holes would be needed -- sounds like a lot of work which is why I made the "when it's not frozen" comment.

    So long as you treat your pool as soon as the ice thaws and before the water warms up, then you can easily kill any algae that has formed. That's what most people do as part of spring opening. Getting rid of a small amount of algae is no big deal.

    Richard
    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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    Re: Algae in the winter?

    I put some polyquat 60 in my pool about the end of November, raised the Chlorine to shock level, and haven't done anything with it since except run the pump on freezing nights and rinsed out my filter once. I have a solar cover on it, and the temperature stays around 50 degrees. When I peeked under the cover a couple of days ago there wasn't any algae growing. I'm thinking that's probably the polyquat helping out.
    Above ground soft side Omega pool
    20 feet diameter, 4 feet deep
    Hayward sand filter
    Hayward 1 HP Matrix pump
    Hayward Aquabug Automatic Pool Cleaner

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