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Thread: Who took my CYA

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    DONNIE's Avatar
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    Who took my CYA

    Hey guys! I've got a pretty good grip on this water thing but something has me puzzled. Two weeks ago my CYA was 40+. Yesterday it was barely registerable (is that a word). We have had 3+ inches of rain and ten days of mostly 95 degrees with bright sunny skies. I have drained no water but lose 1/2" a day to evap. Where did my CYA go. It's never disappeared like that. Everything else is perfect.

    Donnie

    86F, Ph 7.5, FC 3.5, CC 0, Ch 230, TA 80, Cl 3000
    8500 Gallon Fiberglass IG / Sta-Rite pump,cartridge filter & heater / PoolPilot Dig 220-36 SWG / Testing w/K2006

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    Re: Who took my CYA

    YOur refill rate is about double the average so you have probably lost a foot or so of CYA pool water to rain and refills.

    Other than that, I have no clue. I would add enough to get back to 50 or so in Oklahoma.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Butterfly's Avatar
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    Re: Who took my CYA

    Are you running your SWG? If yes, your recommended CYA level is 60 to 80.

    Also, the CYA test is +/- 10 and 20ish CYA is difficult to read.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
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    Re: Who took my CYA

    I would add enough to get back to 50 or so in Oklahoma.
    Did you notice how Butterfly ever so gently mentioned that I completely overlooked your SWG and your CYA should be 60 to 80. Oops!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Butterfly's Avatar
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    Re: Who took my CYA

    Quote Originally Posted by duraleigh
    I would add enough to get back to 50 or so in Oklahoma.
    Did you notice how Butterfly ever so gently mentioned that I completely overlooked your SWG and your CYA should be 60 to 80. Oops!
    It takes a village to raise a pool
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Mod Squad woodyp's Avatar
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    Re: Who took my CYA

    Just your friendly neighborhood Village Idiot here!
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    DONNIE's Avatar
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    Re: Who took my CYA

    Thanks guys! Added 3.5# yesterday. Will check it a little later today. This is my 5th year with the pool and the first time with a CYA issue.

    Donnie
    8500 Gallon Fiberglass IG / Sta-Rite pump,cartridge filter & heater / PoolPilot Dig 220-36 SWG / Testing w/K2006

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    DONNIE's Avatar
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    Re: Who took my CYA

    It's all good now. CYA 60+.

    Donnie
    8500 Gallon Fiberglass IG / Sta-Rite pump,cartridge filter & heater / PoolPilot Dig 220-36 SWG / Testing w/K2006

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    Re: Who took my CYA

    Quote Originally Posted by DONNIE
    It's all good now. CYA 60+.

    Donnie

    Hope you don't mind my asking, but.......

    Now, you added CYA Monday and Tested Tuesday and it is already 60?

    What brand CYA did you use and how did you add it?

    I'm just asking cause it seems really fast for it to appear on a test.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    DONNIE's Avatar
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    Re: Who took my CYA

    I don't recall the brand (Swim-rite maybe). Bought at Lowes. My pool is small and fiberglass. I threw it directly in the pool and it dissolved completley in less than 4 hours. My pump can turn the water over about every 4 hours and I ran it continually. I feel confident testing anything I throw in after 4 hours. I've just never had something disappear so quickly. I don't test CYA except when I have to drain because of rain and always assumed that CYA stayed in the pool unless I take it out.

    Comments on the bold part?

    Donnie
    8500 Gallon Fiberglass IG / Sta-Rite pump,cartridge filter & heater / PoolPilot Dig 220-36 SWG / Testing w/K2006

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    frogabog's Avatar
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    Re: Who took my CYA

    I think Butterfly is alluding to the possibility that in a week, your CYA reading could be much higher. Going from 40 to 0, then back up to 60 after adding CYA a day earlier is slightly suspect. It also doesn't dissolve well when broadcasted, the sock method works very well however (old sock, rubber band, hang from ladder, let soak, squish manually).

    I still maintain that I was able to add 20ppm CYA, squish it all out over the course of 2-3 hours and I got an accurate reading the next day. I haven't added any CYA since, and all readings after that are consistent (it's been weeks).

    So, yeah, you could have an accurate reading but the general rule for CYA is that it takes up to a week to register properly.

    Exactly how much CYA did you add anyway? Did you add 60ppm worth or less? Because if you were at 0, you'd have had to added 60 whole ppm to get to 60. If you added less, your pool wasn't really at 0. And no, the general rule of thumb is that CYA does not go away unless you drain and refill. Rain will dilute it, but gradually. It'd have to rain your entire pool out and displace every bit of the current water to dilute it all the way to 0 (never happen, can't displace only CYA water because rain will mix).
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    DONNIE's Avatar
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    Re: Who took my CYA

    8500 gallon pool. Added 3.5# shooting for 60-80. I don't think I over applied and I'm pretty confident in my testing. I can't test lower than 20 so I had a little wiggle room. Thats why I called it 60+. I do plan on checking it again this weekend.

    Donnie
    8500 Gallon Fiberglass IG / Sta-Rite pump,cartridge filter & heater / PoolPilot Dig 220-36 SWG / Testing w/K2006

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    Re: Who took my CYA

    I know my CYA is disappearing. Having just started up the pool about 10 days ago, I added some granular cya to the skimmer in a sock (approx. 1 lb in a 4.8 k gallon pool) enough to bring it up to 30. 2 days later it was testing at 30. I then realized I needed more living in the sunny desert (thanks to butterfly), so added enough that it was calculated to bring it up to 50. Totally dissolved in 24 hours and 48 hours after adding it was measuring just over 50.

    Now I'm back down to 40. I only tested today b/c it seemed like I was adding a lot of chlorine the last day or two (4 to 5 cups of 6% a day). I guess I need to run more like 60 and keep a closer eye on it.

    My question: I haven't had to add more than an inch of water so far, so does the CYA degrade eventually? Where else could it go?
    Cindy

    4.8 K gallon AGP: sharkline opera 12'x17'x52"
    Sandpro 4511 sand filter and pump

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    Mod Squad Bama Rambler's Avatar
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    Re: Who took my CYA

    It could be a testing anomally. Different lighting, time of day, etc. Since the test is only accurate to ±10% it's basically the same. I'd bump it to 60 and see what happens.
    Dave J. TFP Moderator
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    Re: Who took my CYA

    Thanks Dave. It was just so odd because it was coming up so consistent and then yesterday was drastically different.
    Cindy

    4.8 K gallon AGP: sharkline opera 12'x17'x52"
    Sandpro 4511 sand filter and pump

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