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Thread: Evaporation and CYA

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    Join Date
    Mar 2011
    Location
    Houston, TX
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    70

    Evaporation and CYA

    Is it possible that over time and a hot summer my CYA could drop to within acceptable ranges in HOT Texas. I am replacing approximately 2 inches of water every couple of days. I would suspect that over the next 3 - 4 mos I will be replacing a significant amount of water. Really dreading the 60% water replacement. Any thoughts?
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    18,768

    Re: Evaporation and CYA

    Water evaporates. CYA stays behind. Whatever you read now, it will be the same when you top off the water.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mar 2011
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    Houston, TX
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    Re: Evaporation and CYA

    Wrong answer Richard. I wanted you to tell me that over the HOT summer months I will essentially be replacing half of the water and therefore lowering my CYA. Maintaining FC at 12 is using quite a bit of bleach but the results have been well worth it.
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

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    Dec 2010
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    San Diego, CA
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    Re: Evaporation and CYA

    You will lose CYA with splashed out water...how much of your loss is from evaporation and how much is from use?
    15,600 Gallon, 16' x 32' In-Ground Vinyl Pool
    Pentair VS 3050 pump, Quad DE 60 filter and SunTouch controller
    8 gallon Liquidator, Aquatherm EcoSun Solar Panels, 2 wheel ThePoolCleaner

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    Mar 2011
    Location
    Houston, TX
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    Re: Evaporation and CYA

    Quote Originally Posted by carlscan26
    You will lose CYA with splashed out water...how much of your loss is from evaporation and how much is from use?
    Really no way to know I guess. We have been using the pool daily for two weeks since it is brand new. Guess I should quit fussing at the kids for splashing all the water out.
    18,500 gallons, Cartridge Filter, In Ground Plaster. Jandy CL460 Filter

  6. Back To Top    #6

    Join Date
    Dec 2010
    Location
    San Diego, CA
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    1,129

    Re: Evaporation and CYA

    15,600 Gallon, 16' x 32' In-Ground Vinyl Pool
    Pentair VS 3050 pump, Quad DE 60 filter and SunTouch controller
    8 gallon Liquidator, Aquatherm EcoSun Solar Panels, 2 wheel ThePoolCleaner

  7. Back To Top    #7

    Re: Evaporation and CYA

    I keep some tablets on hand, and when CYA levels drop a bit, I switch over to bump it back up, then go back to bleach.

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