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Thread: CYA-Do I Really Need It As High As

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    Glock30's Avatar
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    CYA-Do I Really Need It As High As

    Jason,
    As you can see I have a SWG in 26+k pool.
    According to the articles on this site and the pool calc. My CYA should be somwhere in the 75 range.
    Am I reading this correctly?
    Why so high?
    I understand these reasons (from Pool School) "Second adjust CYA to between 70 and 80. The biggest mistake that many SWG owners make is NOT having enough CYA in the water! This can create a lot of problems like high acid demand, algae outbreaks, cloudy water, or early cell failure."
    Just curious if there are other reasons based on the use of a SWG.
    Thanks
    18' X 36' Inground Pool 26,000 gallons. SuperMax 27mil/27mil Vinyl Liner-Installed Fall 2011
    Pentair Intellipro Programable Pump (Model 011018) // Pentair S8M 500 Cartridge Filter // Circupool RJ45 Salt Chlorinator
    2 Hayward Skimmers // 3 Returns // 2 Savi Melody Pool lights // TF-100 Test Kit.

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    Re: CYA-Do I Really Need It As High As

    If you don't have very much direct sunlight on the pool or have a pool cover that is at least somewhat opaque, then you wouldn't need the CYA to be high. However, if the pool is exposed to sunlight, then the higher CYA lowers the daily FC loss so that the saltwater chlorine generator doesn't have to be on as long (which makes it last longer and reduces the rate of pH rise from outgassing).
    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: CYA-Do I Really Need It As High As

    This is one of those things that really depends on your location and your pools location. Temperature, the amount of sunlight your pool gets during the day, and a whole bunch of other things factor in here. I live in southeast NY. My pools gets good sun for most of the day. I run my pump for 10 hours/day and set the SWCG at 35%. My CYA has never been above 40. This will consistently maintain a FC of 4-5. Keeping the CYA at the recommended 80 seems completely unnecessary to me. I think this recommendation is high to keep the "average" pool owner out of trouble. I always need to add CYA during the course of the swimming season due to splash out and pump out from heavy rains. I know I'll have to add, so I test accordingly. Most pool owners I know test the CYA infrequently (usually only at the beginning of the season), so if you start out at 80, there's a good chance you'll make the whole season without a problem. If you're willing to be vigilant about testing (which you should be anyway), I would experiment a little to see if you really need such high levels of stabilizer. My completely uneducated and ignorant rule of thumb is this...adjust your CYA to maintain proper FC levels with a SWCG setting of no greater than 45-50% assuming a pump run time of 10-12 hours. (single speed pump)
    27ft Above Ground Pool
    Sand filter

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    Re: CYA-Do I Really Need It As High As

    I didn't keep my cya high enough last summer and the sun just ate up the chlorine in our pool. Of course it was one of the hottest summers on record in the DFW area!
    12k gal gunite, Sunstone Plaster, Pentair IntelliFloŽ VS+SVRS Variable Speed Pump, Pentair Intellichlor IC-40, Pentair CCP520 cart filter

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    Glock30's Avatar
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    Re: CYA-Do I Really Need It As High As

    We get the pool 100% in the sun from about 9AM to 5 PM so I am guessing I will need a higher CYA number.
    I also would like to run my SWG at about 40% if possible.
    I need to set my pump times up first and adjust accordingly.
    18' X 36' Inground Pool 26,000 gallons. SuperMax 27mil/27mil Vinyl Liner-Installed Fall 2011
    Pentair Intellipro Programable Pump (Model 011018) // Pentair S8M 500 Cartridge Filter // Circupool RJ45 Salt Chlorinator
    2 Hayward Skimmers // 3 Returns // 2 Savi Melody Pool lights // TF-100 Test Kit.

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    Re: CYA-Do I Really Need It As High As

    I have mine currently at 60% just because it's not producing much since water temp is still a little low. Probably bump it back down to 50-54 once it heats up some more.
    12k gal gunite, Sunstone Plaster, Pentair IntelliFloŽ VS+SVRS Variable Speed Pump, Pentair Intellichlor IC-40, Pentair CCP520 cart filter

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    Re: CYA-Do I Really Need It As High As

    One thing that I forgot to mention...try to keep your salt level at the high end of maximum. This seems to allow for more effecient production of chlorine and shorter run times for the cell.
    27ft Above Ground Pool
    Sand filter

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    Re: CYA-Do I Really Need It As High As

    I keep mine at the "ideal" level recommended on the unit.
    12k gal gunite, Sunstone Plaster, Pentair IntelliFloŽ VS+SVRS Variable Speed Pump, Pentair Intellichlor IC-40, Pentair CCP520 cart filter

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