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Thread: Pool temp 100+ what to look out for

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    Pool temp 100+ what to look out for

    My pool temps are getting up to and over 100 degrees pretty regularly these days. Is there anything that I need to be aware of at these temps? I'm assuming that algae could be a real problem with water this warm. Are there any additional precautions I need to take?
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    Lershac's Avatar
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    Re: Pool temp 100+ what to look out for

    Where do you live?
    (DIY):16K Gal 20X30 rectangular IG Gunite, w/spa, CCP 520 filter,2 Pentair VS pumps, 400KBTU Pentair gas heater, Heat Pump for cooling, **update5.25.2013** added an intellichem with acid pump that will control existing SWG. My Build Thread Here

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    Re: Pool temp 100+ what to look out for

    South Mississippi, right on the coast
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    Re: Pool temp 100+ what to look out for

    Though algae growth rates can continue to climb up to around 104ºF (see this paper), it depends on the species of algae. Even so, chlorine kill rates climb as well, usually faster than algae growth rates. However, chlorine loss rate is faster so the chances of the chlorine level getting too low are higher and that's the primary reason algae can start to grow. If you are diligent about maintaining your chlorine level, then you should not have a problem, but you may need to add chlorine more frequently and probably add more than you are used to doing.

    As shown in this map, you've got moderate evaporation rates so probably not quite high enough to cool your pool faster than it heats up during the day (say, compared to Arizona). If you had a white or reflective pool cover on during the day and took it off at night, then you could keep your pool cooler. A white plaster pool of average 4.5 foot depth will absorb around 60% of the sun's energy. For Gulfport, MI, for example, the average high in July is 91ºF and the average low 74ºF so if the pool wasn't getting net heating from the sun then it would be at around 83-84ºF. You must be having hotter than normal weather or you are using a darker or clear solar cover.
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    cramar's Avatar
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    Re: Pool temp 100+ what to look out for

    100
    I'm trying everything just get up to 80!!
    Must be nice. I've read some people using a solar heater set up in warm climates, instead of running during the day they run at night to cool the pool down.
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    Diver's Avatar
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    Re: Pool temp 100+ what to look out for

    you can try to run the pump at night and it will help a bit
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    maxepr1's Avatar
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    Re: Pool temp 100+ what to look out for

    CGS, you should look into cooling towers. They can bring down that temp. a bit.
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    Re: Pool temp 100+ what to look out for

    I've got a fountain that I can use. I'm not sure how much it would drop the temp. I assume the best time to use it would be at night since aerating during the day would likely not help as much compared to cooler evening temps. It has been above 95 pretty much every day for quite a while, but the sun is pretty intense and there is no shade on the pool. It is also only 5' deep at the deepest part so that contributes a lot as well. i'm definitely not using anything to heat the pool up, that is for sure.
    24,000 G, Sand, IG, Vinyl

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    Re: Pool temp 100+ what to look out for

    Actually, aeration during the day is effective unless the humidity is high. Water evaporating cools the remaining water so you want to spray coarse enough to still have water come back into the pool (i.e. don't just mist).

    It's only running water through solar panels where you'd only want to do that at night since that effect is based on thermal transfer, not evaporation.
    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: Pool temp 100+ what to look out for

    High humidity is the name of the game around here!
    24,000 G, Sand, IG, Vinyl

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