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Thread: CYA

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    Join Date
    May 2013
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    CYA

    I've drained and refilled and have the CYA at what I think (kit shows up today or tomorrow) is a workable level.

    Q. Throughout the summer, will CYA levels be affected by evaporation? That question has been driving me nuts for a week
    18 x 30 IG vinyl "sports pool" 16k
    Hayward pump & sand filter. Polaris cleaner (older model) & booster pump.
    K-2006 test kit

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    harleysilo's Avatar
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    Re: CYA

    Yes, as you refill lost water your CYA will go down.
    18'x43' Sport Pool
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    Re: CYA

    Thanks! I just didn't know chemically speaking if CYA would be a part of the evaporation process or if it separated from the water evaporating and remained in the pool! Thanks again.
    18 x 30 IG vinyl "sports pool" 16k
    Hayward pump & sand filter. Polaris cleaner (older model) & booster pump.
    K-2006 test kit

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    Richard320's Avatar
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    Re: CYA

    Quote Originally Posted by RowdyC
    I've drained and refilled and have the CYA at what I think (kit shows up today or tomorrow) is a workable level.

    Q. Throughout the summer, will CYA levels be affected by evaporation? That question has been driving me nuts for a week
    Not really. CYA doesn't evaporate. For illustration, let's say your average pool depth is 50 inches (makes easy math). If you let the level drop 2" before refilling, that's 4%. If CYA was at 50, it's now at 52. You probably won't see that change on the tester view tube. And when you refill it to bring it back up to 50" deep, CYA will be back at 50.

    The only way you lose CYA is by splashout, what sticks to people when they get out of the pool, and what you lose when backwashing. Remember, you're measuring parts per million. That's pretty small. 50 ppm is only .005%
    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.
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    thehowheels's Avatar
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    Re: CYA

    Quote Originally Posted by RowdyC
    Thanks! I just didn't know chemically speaking if CYA would be a part of the evaporation process or if it separated from the water evaporating and remained in the pool! Thanks again.
    CYA does not evaporate. You can reduce your CYA by draining / backwashinig, or through splash-out. There are some reports of pool owners experiencing unexpected CYA loss after closing and re-opening, but it is definitely not typical.
    Matt
    9k gallon, plaster, IG. Raised spa w/ spillover into pool. AO Smith Century Centurion / Purex Triton WisperFlo 0.5 HP, Hayward 1.5 HP (spa), Polaris 1-516-01 1.5 HP (blower). Hayward DE3620 36 ft2 72 GPM DE Filter, Polaris 145 cleaner. Pool built ~1980.
    Trouble-free, BBB since: April 25, 2013

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    Join Date
    May 2013
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    Norman, Ok
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    Re: CYA

    Thank you both! I'm trying to convert a neglected "pool store" pool into a BBB pool. So as I'm trying to be patient, I'm thinking about things such as this CYA thing. Thank you. And BTW, we just bought the house and pool in November, so I'm NOT the neglectful party.
    18 x 30 IG vinyl "sports pool" 16k
    Hayward pump & sand filter. Polaris cleaner (older model) & booster pump.
    K-2006 test kit

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