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Thread: 2 questions one off topic

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    2 questions one off topic

    Hey all,
    I am curious about my chlorine reading it is at 26 as I shocking with a sledgehammer, can I get in at that reading wanna get my feet and legs in to do some vacuuming in the shallow end, and I also have a problem under my cement on the shallow in, right before my steps that go into the pool, seems the dirt/earth has washed away under the cement and it fills a bit springy, is this a fix that I can do or do I need a concrete guy to come out? English is my first language just not the best at it.

    Thanks
    Kram
    Foxx Pool Grecian 27000 gallons (vinyl liner)
    Sand Filter w/ 300 #'s of Brand New Sand 6/3/11

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    JasonLion's Avatar
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    Re: 2 questions one off topic

    It all depends on your CYA level. If CYA is zero that is way way way too much chlorine. But if CYA is 90 that is not really enough to shock the pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: 2 questions one off topic

    Mainly worried about hopping in and doing a little vacuuming, at that high a reading. Jason Pool store says I am at 0 but I do the test and it looks around 40
    Foxx Pool Grecian 27000 gallons (vinyl liner)
    Sand Filter w/ 300 #'s of Brand New Sand 6/3/11

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    JasonLion's Avatar
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    Re: 2 questions one off topic

    If CYA is 40, or lower, I don't really recommend getting in. If you wear clothes that you don't care about ruining and don't get your head wet it probably won't be a big deal, but that is a very high FC level for CYA around 40.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: 2 questions one off topic

    Thanks Jason,
    The precision of the test, when done correctly, is around plus or minus 15 for levels up to 90 and plus or minus 30 for levels between 100 and 200. Novices often have problems reading the test correctly, and tend to get higher than actual readings.

    I am a novice that is hooping 40 is close, where do you recomend taking it to get an acurate reading, or is theere a way of seeing it in the day to day workings of my pool?
    Foxx Pool Grecian 27000 gallons (vinyl liner)
    Sand Filter w/ 300 #'s of Brand New Sand 6/3/11

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    JasonLion's Avatar
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    Re: 2 questions one off topic

    When things are in balance, you can estimate your CYA level by noting your starting FC level and then watching how much chlorine you lose over a sunny day.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: 2 questions one off topic

    Whats typical, as in a 27000 gallon pool or does the size not realy matter, is it more the sun, as I am in 100% sun for the whole freaking day and we are having 90 degree days for the next 10 days, or should I say mi 90's
    Foxx Pool Grecian 27000 gallons (vinyl liner)
    Sand Filter w/ 300 #'s of Brand New Sand 6/3/11

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    Re: 2 questions one off topic

    Quote Originally Posted by JasonLion
    When things are in balance, you can estimate your CYA level by noting your starting FC level and then watching how much chlorine you lose over a sunny day.
    I'd like to hear more on that topic!
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    Re: 2 questions one off topic

    Quote Originally Posted by woodyp
    Quote Originally Posted by JasonLion
    When things are in balance, you can estimate your CYA level by noting your starting FC level and then watching how much chlorine you lose over a sunny day.
    I'd like to hear more on that topic!
    x2
    Aaron
    [ Vogue Vectra 24' AG | Hard plumb: Hayward Power-Flo Matrix 1HP 2-speed, 27" sand filter & Pentair MiniMax 100 NG | Taylor K-2006 | Central IL ]
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    Re: 2 questions one off topic

    i would think there would be so many variables to accurately judge CYA level based on FC loss. it was cloudy yesterday in my neck of the woods and my 24 hour FC loss was only .5 ppm (coming from 8.5 to 8). that kinda looked weird to me and i started thinking that my CYA was higher then i though (40 ppm). but then i figured it was cloudy, plus i have 80% of water covered by solar blanket, so it might've been true.
    26K In-ground Vinyl Pool | Hayward DE4820/SP0710XR50 filter | 1.125 HP Dual Speed Hayward Super Pump | Aquasol Solar

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    JasonLion's Avatar
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    Re: 2 questions one off topic

    I did say estimate. You won't get precision this way, just a double check that you are in the correct ballpark. CYA around 50 will lose roughly 50% of your starting level. Losing all of your chlorine in one day means CYA is below 20. CYA up around 70 will lose less than 1/4 of your starting FC level. Of course all of this varies with the amount of sunlight you get and the water temperature.

    It is a good way to decide if CYA is zero or 40. Not a good way to decide if CYA is 30 or 40.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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