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Thread: Solar Cover and Evaporation

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    Join Date
    Jan 2009
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    Cupertino, CA
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    Solar Cover and Evaporation

    A cover would also help reduce evaporation in the summer, right?
    California is in deep drought doo-doo, I'd like to minimize what I have to feed the pool.
    --paulr
    who is still persuading himself this would be a good idea
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Solar Cover and Evaporation

    Yes, a solar cover will dramatically reduce the amount of evaporation.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: Solar Cover and Evaporation

    I live in the same general area as you do and I had started out using a solar cover regularly but in the end I didn't use it as much as I would have liked. I still think they are a good idea, just make sure that you make it easy so you will be more inclined to use it. This year I may be forced to use more often.

    What I found was a bigger contributor to evaporation was using solar. The higher the water temp, the higher the evaporation. Solar covers also increase the water temp and thus increase the evaporation when not in use.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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    Join Date
    Mar 2007
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    San Rafael, CA USA
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    12,085

    Re: Solar Cover and Evaporation

    One tradeoff is getting an electric opaque safety cover (that's what I have). You would definitely use it and it eliminates evaporation whenever the cover is on, but because it is opaque you don't get the heating benefit of a clear solar cover. It is also thinner so less insulating at night. It seems that the heat loss with the safety cover is about half, but with a bubble-type solar cover it would probably cut the heat loss to 1/4 compared to no cover.

    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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