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Thread: CYA dropped within 48 hours

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    CYA dropped within 48 hours

    I was SLAMing out green water so keeping high chlorine levels. CYA was below 10 so I added stabilizer through the skimmer two nights ago. Tested next morning and found

    FC 23
    CC 0
    pH 7.2
    TA 120
    CH 150
    CYA 30

    water was crystal clear until big swim party today and water turned a bit cloudy so tested again (48 hours after adding stabilizer to skimmer)

    FC 12
    CC 0
    Ph 7.2
    TA 120
    CH 150
    CYA 20

    What accounts for the loss of CYA? Is it just that I tested too early the first time? Or the little bit of hose water I added to replace splash-out (ran hose 10 minutes)? Just want to make sure that I do it right when I add more CYA this time.

    Thanks
    Vinyl IG 18x43 25,000 gallon
    Hayward Pro s244T 300 lb Sand (with occasional addition of clarifier)
    1.5 HP pump; Polaris 380 with booster pump; Hayward H400 gas heater
    TF-100 with SpeedSTIR

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    Mod Squad jblizzle's Avatar
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    Re: CYA dropped within 48 hours

    10ppm is within the noise of the test. Likely just variations in test procedure.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: CYA dropped within 48 hours

    Ok, thanks. So should I add more or not? If so, how much do you recommend?
    Vinyl IG 18x43 25,000 gallon
    Hayward Pro s244T 300 lb Sand (with occasional addition of clarifier)
    1.5 HP pump; Polaris 380 with booster pump; Hayward H400 gas heater
    TF-100 with SpeedSTIR

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    AimeeH's Avatar
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    Re: CYA dropped within 48 hours

    also, make sure you are testing in bright sunlight with your back to the sun. Lighting really matters on that test.

    Extended Test Kit Directions
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Mod Squad jblizzle's Avatar
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    Re: CYA dropped within 48 hours

    Add another 10ppm ... even if you end up at 40ppm that would be fine.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: CYA dropped within 48 hours

    Thank you all. I will go out now and add some more, test again in 48 hours, right? Thanks again
    Vinyl IG 18x43 25,000 gallon
    Hayward Pro s244T 300 lb Sand (with occasional addition of clarifier)
    1.5 HP pump; Polaris 380 with booster pump; Hayward H400 gas heater
    TF-100 with SpeedSTIR

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    May 2014
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    Lewisberry, PA
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    Re: CYA dropped within 48 hours

    Don't go too crazy with adding stabilizer. (CYA) It takes up to two weeks for it to show up on your test results. GO EASY! If you add too much you are back to draining the water.
    16,000 gallon Oval Vinyl Liner Pool (new liner 2014)
    Custom built in 1999 to be half in-ground and half out (sloped yard) vermiculite bottom, laser sighted to Florida Room and Deck
    Purex Triton Model cc100 Cartridge Filter, 100 gpm flow rate, Penfair 1HP Pump
    TF-100 Test Kit

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    Re: CYA dropped within 48 hours

    It takes up to two weeks for it to show up on your test results
    Actually, we have found that most all CYA is testable withing 24 hours so we have lowered our guideline to wait 48 hours before testing.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA dropped within 48 hours

    Quote Originally Posted by duraleigh View Post
    Actually, we have found that most all CYA is testable withing 24 hours so we have lowered our guideline to wait 48 hours before testing.
    Maybe I'm still from the Old Pool School! LOL Thanks for the new info Dave.
    16,000 gallon Oval Vinyl Liner Pool (new liner 2014)
    Custom built in 1999 to be half in-ground and half out (sloped yard) vermiculite bottom, laser sighted to Florida Room and Deck
    Purex Triton Model cc100 Cartridge Filter, 100 gpm flow rate, Penfair 1HP Pump
    TF-100 Test Kit

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    AimeeH's Avatar
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    Re: CYA dropped within 48 hours

    Quote Originally Posted by duraleigh View Post
    Actually, we have found that most all CYA is testable withing 24 hours so we have lowered our guideline to wait 48 hours before testing.
    I have found in particular this year that what Walmart is selling dissolves more readily than in years past. And it showed up on my tests.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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